Half-round trailer

1. A trailer comprising:

a chassis comprising at least one axle, said axle comprising left and right wheel and tire assemblies that support the chassis for rolling movement on a surface;

a body supported on the chassis, said body comprising: (i) left and right sidewalls spaced apart from each other and respectively located on opposite left and right lateral sides of the body; (ii) a curved floor that extends between the left and right sidewalls; (iii) a bulkhead located at a front end of the body and extending between the left and right sidewalls; (iv) a tailgate located a rear end of the body and extending between the left and right sidewalls, said tailgate movable relative to the left and right sidewalls between an opened position and a closed position; (v) an open-top cargo space for containing an associated bulk commodity defined between said left and right sidewalls, said floor, said bulkhead, and said tailgate, wherein a dump opening of the cargo space is defined between the left and right sidewalls and is blocked by said tailgate when said tailgate is in its closed position and is at least partially unblocked when said tailgate is in its opened position;

said bulkhead comprising a one-piece aluminum alloy bulkhead sheet formed into a three-panel shape comprising a left panel, a right panel, and a central panel, said bulkhead comprising opposite inner and outer sides wherein said inner side is oriented toward the cargo space and a respective obtuse angle is defined between the central panel and each of the left and right panels on said inner side of said bulkhead.

2. The trailer as set forth in claim 1 , wherein said bulkhead is arranged in a forward sloping orientation with a bottom edge of the bulkhead that is adjacent to the floor located closer to said tailgate relative to an upper edge of said bulkhead that is spaced above said floor such that the left and right panels of the bulkhead diverge outwardly away from the central panel of the bulkhead in opposite directions as they extend rearwardly relative to the central panel.

3. The trailer as set forth in claim 2 , further comprising:

a lift cylinder frame located adjacent the outer side of the bulkhead, said lift cylinder frame comprising left and right cylinder mounting beams;

a hydraulic cylinder operably connected between the cylinder mounting beams for selectively elevating the front end of the body relative to the rear end of the body.

4. The trailer as set forth in claim 3 , further comprising a hydraulic cylinder cover that at least partially covers the hydraulic cylinder to reduce aerodynamic drag, said hydraulic cylinder cover comprising: (i) a curved central portion that extends between the left and right cylinder mounting beams of the lift cylinder frame; and (ii) opposite left and right mounting flanges that are respectively connected to the left and right cylinder mounting beams of the lift cylinder frame;

wherein the curved central portion comprises an outer convexly curved surface that is oriented away from the hydraulic cylinder.

5. The trailer as set forth in claim 2 , wherein said floor comprises first and second floor sheets of aluminum that are joined together by welding at a primary floor seam that extends between the left and right sidewalls.

6. The trailer as set forth in claim 5 , wherein:

the left sidewall comprises first and second sidewall sheets of aluminum joined together by welding at a left sidewall seam;

the right sidewall comprises first and second sidewall sheets of aluminum joined together by welding at a right sidewall seam;

said trailer further comprises a bolster that extends under the floor and that is axially aligned with and covers the primary floor seam.

7. The trailer as set forth in claim 6 , wherein said first and second sidewall sheets of said left sidewall and said first and second sheets of said right sidewall each comprise: (i) a continuously curved first portion connected to the floor; and (ii) a planar second portion that extends vertically upwardly from the first curved portion;

wherein an axially extending left floor seam is defined where the first portion of the first and second sheets of the left sidewall are welded to a left lateral edge of the floor and an axially extending right floor seam is defined where the first portion of the first and second sheets of the right sidewall are welded to a right lateral edge of the floor.

8. The trailer as set forth in claim 7 , further comprising:

a left bottom rail that extends axially between said front and rear ends of said body and that covers said left floor seam, said left bottom rail comprising first and second left bottom rail legs that intersect at a 90-degree angle and that are connected respectively to the left sidewall and the floor;

a right bottom rail that extends axially between said front and rear ends of said body and that covers said right floor seam, said right bottom rail comprising first and second right bottom rail legs that intersect at a 90-degree angle and that are connected respectively to the right sidewall and the floor.

9. The trailer as set forth in claim 8 , further comprising:

a left upper cap-off gusset welded between the first leg of the left bottom rail and the inner side of said bulkhead;

a left lower cap-off gusset welded between the second leg of the left bottom rail and the inner side of said bulkhead;

a right upper cap-off gusset welded between the first leg of the right bottom rail and the inner side of said bulkhead;

a right lower cap-off gusset welded between the second leg of the right bottom rail and the inner side of said bulkhead;

wherein said gussets strengthen a connection between the left and right bottom rails and the bulkhead.

10. The trailer as set forth in claim 9 , further comprising left and right bulkhead support gussets connected to the bulkhead inner side, wherein the left and right bulkhead support gussets are respectively connected to the left and right panels of the bulkhead and are aligned respectively with the left and right bottom rails to strengthen the bulkhead where it is connected to the bottom rails.

11. The trailer as set forth in claim 10 , further comprising:

left and right top rails respectively connected to the left and right sidewalls and each extending axially between the front and rear ends of the body;

a wrap brace that extends laterally across the bulkhead and that comprises opposite left and right ends that are respectively connected to the left and right top rails.

12. The trailer as set forth in claim 1 , wherein said chassis comprises:

a chassis subframe comprising left and right subframe beams interconnected by multiple subframe cross-members;

a subframe tower that joins the chassis subframe to the body;

wherein the at least one axle is connected to the chassis subframe.

13. The trailer as set forth in claim 12 , wherein the subframe tower comprises:

left and right tower bases connected respectively to the left and right subframe beams;

left and right tower plates that are respectively connected to the left and right tower bases and that are respectively connected to the left and right bottom rails; and

a plurality of tower cross-members that extend between and interconnect the left and right tower bases and that extend between and interconnect the left and right tower plates.

14. The trailer as set forth in claim 13 , wherein:

each tower cross-member comprises a left end connected to the left bottom rail and an opposite right end connected to the right bottom rail; and

each tower cross-member comprises a curved upper edge that contacts and supports said floor.

15. The trailer as set forth in claim 14 , wherein:

said left end of each tower cross-member is welded to said second leg of said left bottom rail; and,

said right end of each tower cross-member is welded to said second leg of said right bottom rail.

16. The trailer as set forth in claim 14 , wherein said left and right tower bases each comprise a one-piece aluminum extrusion including a flat body and a wall notch;

said flat body of said left tower base connected to said left subframe beam and said wall notch of said left tower base engaged with said left tower plate;

said flat body of said right tower base connected to said right subframe beam and said wall notch of said right tower base engaged with said right tower plate.

17. The trailer as set forth in claim 16 , further comprising an air deflector that is connected to and covers a front of said chassis subframe and subframe tower.