Chassis for recreational vehicles having at least one crawl space

1. A recreational vehicle comprising a chassis, at least one axle assembly, a vehicle body, and a composite floor, wherein:

the composite floor comprises an upper sheet and lower sheet bonded to a skeletal framework as a structurally integrated composite;

the vehicle body and the composite floor are supported by the chassis;

the axle assembly is coupled to the chassis and provides motive support and underbody clearance to the chassis;

the chassis comprises a plurality of longitudinal main rails, a plurality of lateral crawl space cross members, at least one longitudinal floor support, and at least one insulation sheet, wherein:

the composite floor, the plurality of longitudinal main rails, the plurality of lateral crawl space cross members, the at least one longitudinal floor support, and the at least one insulation sheet collectively define at least one crawl space; and

each of the at least one crawl space having an upper surface defined by the composite floor, a bottom surface defined by the plurality of lateral crawl space cross members and the at least one insulation sheet, and sides defined by the at least one insulation sheet;

the plurality of longitudinal main rails span at least a portion of a length of the recreational vehicle and define a length of the at least one crawl space;

the plurality of lateral crawl space cross members extend between and interconnect the plurality of longitudinal main rails and define a width of the at least one crawl space, wherein an upper face of the plurality of lateral crawl space cross members is lower than an upper face of the plurality of longitudinal main rails; and

the at least one longitudinal floor support is positioned between the composite floor and the plurality of lateral crawl space cross members, the at least one longitudinal floor support operable to provide support is to the composite floor.

2. The recreational vehicle of claim 1 , wherein the at least one crawl space extends the entire length of the recreational vehicle.

3. The recreational vehicle of claim 1 , wherein the chassis further comprises a plurality of outriggers extending from the plurality of longitudinal main rails, the plurality of outriggers are operable to support an outer periphery of the composite floor.

4. The recreational vehicle of claim 3 , wherein the plurality of outriggers each comprise outer ends interconnected only by the composite floor.

5. The recreational vehicle of claim 1 , wherein the at least one longitudinal floor support is positioned between the composite floor and upper faces of the plurality of lateral crawl space cross members.

6. The recreational vehicle of claim 1 , wherein the at least one longitudinal floor support comprises a hat channel having an upper surface, two vertical surfaces extending from the upper surface, and a lower surface extending from the two vertical surfaces and substantially parallel to the upper surface.

7. The recreational vehicle of claim 1 , wherein the at least one longitudinal floor support is a single continuous longitudinal floor support.

8. A recreational vehicle comprising a chassis, at least one axle assembly, a vehicle body, and a composite floor wherein:

the composite floor comprises an upper sheet, a lower sheet, and a foam core insert disposed between the upper and lower sheets as a structurally integrated composite;

the vehicle body and the composite floor are supported by the chassis;

the axle assembly is coupled to the chassis and provides motive support and underbody clearance to the chassis;

the chassis comprises a plurality of longitudinal main rails, a plurality of lateral crawl space cross members, at least one longitudinal floor support, and at least one insulation sheet, wherein:

the composite floor, the plurality of longitudinal main rails, the plurality of lateral crawl space cross members, the at least one longitudinal floor support, and the at least one insulation sheet collectively define at least one crawl space; and

each of the at least one crawl space having an upper surface defined by the composite floor, a bottom surface defined by the plurality of lateral crawl space cross members and the at least one insulation sheet, and sides defined by the at least one insulation sheet, thereby providing the at least one crawl space with insulation above, below and to each side of the at least one crawl space;

the plurality of longitudinal main rails span at least a portion of a length of the recreational vehicle and define a length of the at least one crawl space;

the plurality of lateral crawl space cross members extend between and interconnect the plurality of longitudinal main rails and define a width of the at least one crawl space, wherein an upper face of the plurality of lateral crawl space cross members is lower than an upper face of the plurality of longitudinal main rails; and

the at least one longitudinal floor support is positioned between the composite floor and the plurality of lateral crawl space cross members, the at least one longitudinal floor support is operable to provide support to the composite floor.

9. The recreational vehicle of claim 8 , wherein the at least one crawl space extends the entire length of the recreational vehicle.

10. The recreational vehicle of claim 8 , wherein the at least one longitudinal floor support comprises a hat channel having an upper surface, two vertical surfaces extending from the upper surface, and a lower surface extending from the two vertical surfaces and substantially parallel to the upper surface.

11. The recreational vehicle of claim 8 , wherein the at least one insulation sheet lines an inner surface of the plurality of longitudinal main rails, sides of the at least one longitudinal floor support, and an upper face of the plurality of lateral crawl space cross members, the at least one insulation sheet spanning gaps between the plurality of lateral crawl space cross members.

12. A recreational vehicle comprising a chassis, at least one axle assembly, a vehicle body, and a composite floor, wherein:

the composite floor comprises an upper sheet and lower sheet bonded to a skeletal framework as a structurally integrated composite;

the vehicle body and the composite floor are supported by the chassis;

the axle assembly is coupled to the chassis and provides motive support and underbody clearance to the chassis;

the chassis comprises a plurality of longitudinal main rails, a plurality of lateral crawl space cross members, and at least one longitudinal floor support, wherein the plurality of longitudinal main rails, the plurality of lateral crawl space cross members, and the at least one longitudinal floor support collectively define at least one crawl space;

the plurality of longitudinal main rails span at least a portion of a length of the recreational vehicle and define a length of the at least one crawl space;

the plurality of lateral crawl space cross members extend between and interconnect the plurality of longitudinal main rails and define a width of the at least one crawl space, wherein an upper face of the plurality of lateral crawl space cross members is lower than an upper face of the plurality of longitudinal main rails; and

the at least one longitudinal floor support comprises an upper surface, two vertical surfaces extending from the upper surface, and a lower surface extending from the two vertical surfaces and substantially parallel to the upper surface and is positioned between the composite floor and the plurality of lateral crawl space cross members, the at least one longitudinal floor support operable to provide support to the composite floor, wherein the at least one longitudinal floor support is a hat channel.

13. The recreational vehicle of claim 12 , wherein the at least one crawl space extends the entire length of the recreational vehicle.

14. A recreational vehicle comprising a chassis, at least one axle assembly, a vehicle body, a composite floor, and a climate control system with ductwork, wherein:

the composite floor comprises an upper sheet and lower sheet bonded to a skeletal framework as a structurally integrated composite;

the vehicle body and the composite floor are supported by the chassis;

the axle assembly is coupled to the chassis and provides motive support and underbody clearance to the chassis;

the chassis comprises a plurality of longitudinal main rails, a plurality of lateral crawl space cross members, and at least one longitudinal floor support, wherein:

the composite floor, the plurality of longitudinal main rails, the plurality of lateral crawl space cross members, the at least one longitudinal floor support, and the at least one insulation sheet collectively define at least one crawl space; and

each of the at least one crawl space having an upper surface defined by the composite floor, a bottom surface defined by the plurality of lateral crawl space cross members, and sides defined by the plurality of longitudinal main rails or the at least one longitudinal floor support;

the plurality of longitudinal main rails span at least a portion of a length of the recreational vehicle and define a length of the at least one crawl space;

the plurality of lateral crawl space cross members extend between and interconnect the plurality of longitudinal main rails and define a width of the at least one crawl space, wherein an upper face of the plurality of lateral crawl space cross members is lower than an upper face of the plurality of longitudinal main rails;

the at least one longitudinal floor support is positioned between the composite floor and the plurality of lateral crawl space cross members, the at least one longitudinal floor support operable to provide support to the composite floor; and

at least a portion of the ductwork of the climate control system comprises rigid ductwork that is routed in the at least one crawl space.

15. The recreational vehicle of claim 14 , wherein the at least one crawl space extends the entire length of the recreational vehicle.

16. The recreational vehicle of claim 14 , wherein the ductwork is non-insulated.

17. The recreational vehicle of claim 14 , wherein the climate control system in the at least one crawl space defines a supply duct and a return plenum, the ductwork of the climate control system being the supply duct and a remaining area in the at least one crawl space being the return plenum.

18. A recreational vehicle comprising a chassis, at least one axle assembly, a vehicle body, a composite floor, and at least one holding tank, wherein:

the vehicle body and the composite floor are supported by the chassis;

the axle assembly is coupled to the chassis and provides motive support and underbody clearance to the chassis;

the chassis comprises a plurality of longitudinal main rails, a plurality of lateral crawl space cross members, and at least one longitudinal floor support, wherein:

the composite floor, the plurality of longitudinal main rails, the plurality of lateral crawl space cross members, and the at least one longitudinal floor support collectively define at least one crawl space; and

each of the at least one crawl space having an upper surface defined by the composite floor, a bottom surface defined by the plurality of lateral crawl space cross members, and sides defined by the plurality of longitudinal main rails or the at least one longitudinal floor support;

the plurality of longitudinal main rails span at least a portion of a length of the recreational vehicle and define a length of the at least one crawl space;

the plurality of lateral crawl space cross members extend between and interconnect the plurality of longitudinal main rails and define a width of the at least one crawl space, wherein an upper face of the plurality of lateral crawl space cross members is lower than an upper face of the plurality of longitudinal main rails, thereby providing a holding tank receiving area defined below the at least one crawl space;

the holding tank receiving area is operable to receive and support the at least one holding tank; and

the at least one longitudinal floor support is positioned between the composite floor, the plurality of lateral crawl space cross members, and the at least one holding tank, the at least one longitudinal floor support operable to provide support is to the composite floor and to limit upward expansion of an upper surface of the at least one holding tank toward the composite floor.

19. The recreational vehicle of claim 18 , wherein the at least one crawl space extends the entire length of the recreational vehicle.

20. The recreational vehicle of claim 18 , wherein the holding tank receiving area comprises an area below the at least one longitudinal floor support, between a pair of the plurality of longitudinal main rails, and between a pair of the plurality of lateral crawl space cross members.