Heavy duty truck chassis having rear mounted fuel tank

1. A heavy-duty truck comprising:

a heavy-duty truck chassis comprising:

a frame assembly having a first rail spaced from a second rail to define a gap therebetween, wherein the first and second rails each have a maximum width defining an outermost boundary thereof;

a front axle supported by the frame assembly and positioned proximate a front portion of the frame assembly; and

at least one rear axle supported by the frame assembly and positioned proximate a rear portion of the frame assembly;

a fuel tank supported by the frame assembly and positioned in the gap between the first and second rails and behind the at least one rear axle, wherein the fuel tank is supported by the frame assembly by a support structure connected to the first and second rails, and wherein the fuel tank has an inlet and the first rail has an opening positioned proximate the inlet and passing completely through the first rail; and

a supply conduit passing through the opening and extending outside the outermost boundary of the first rail, wherein the supply conduit is in communication with the inlet and is configured to deliver fuel to the fuel tank.

2. The truck of claim 1 , further comprising:

an operator cab supported by the chassis; and

a heavy-duty truck body supported by the chassis, wherein the body is spaced rearwardly from the operator cab and includes components configured for a vocational operation.

3. The truck of claim 1 , wherein the support structure includes at least a first lateral support member extending between the first and second rails over a top portion of the fuel tank and a second lateral support member extending beneath a bottom portion of the fuel tank.

4. The truck of claim 1 , wherein the at least one rear axle further comprises a second rear axle, wherein the fuel tank is positioned behind both rear axles.

5. The truck of claim 1 , wherein the first and second rails each have inner surfaces facing the gap, a flange extending from the inner surface into the gap, and a flat outer surface facing away from the gap, wherein the outermost boundary of each of the first and second rails is defined between the flat outer surface and an inner end of the flange.

6. The truck of claim 5 , wherein the supply conduit extends past the flat outer surface of the first rail.

7. The truck of claim 1 , wherein the supply conduit has a distal end mounted to a side portion of the chassis.

8. A heavy-duty truck comprising:

a heavy-duty truck chassis comprising:

a frame assembly having a first rail spaced from a second rail to define a gap therebetween, wherein the first and second rails each have inner surfaces facing the gap, a flange extending from the inner surface into the gap, and a flat outer surface facing away from the gap;

a front axle supported by the frame assembly and positioned proximate a front portion of the frame assembly; and

at least one rear axle supported by the frame assembly and positioned proximate a rear portion of the frame assembly;

a fuel tank supported by the frame assembly and positioned in the gap and behind the at least one rear axle, wherein the fuel tank is supported by the frame assembly by a support structure connected to the first and second rails, and wherein the fuel tank has an inlet and the first rail has an opening positioned proximate the inlet and passing completely through the first rail; and

a supply conduit passing through the opening and extending past the flat outer surface of the first rail, wherein the supply conduit is in communication with the inlet and is configured to deliver fuel to the fuel tank.

9. The truck of claim 8 , further comprising:

an operator cab supported by the chassis; and

a heavy-duty truck body supported by the chassis, wherein the body is spaced rearwardly from the operator cab and includes components configured for a vocational operation.

10. The truck of claim 8 , wherein the support structure includes at least a first lateral support member extending between the first and second rails over a top portion of the fuel tank and a second lateral support member extending beneath a bottom portion of the fuel tank.

11. The truck of claim 8 , wherein the at least one rear axle further comprises a second rear axle, wherein the fuel tank is positioned behind both rear axles.

12. The truck of claim 8 , wherein the supply conduit has a distal end mounted to a side portion of the chassis.

13. A heavy-duty truck comprising:

a heavy-duty truck chassis comprising:

a frame assembly having a first rail spaced from a second rail to define a gap therebetween;

a front axle supported by the frame assembly and positioned proximate a front portion of the frame assembly;

a rear axle supported by the frame assembly and positioned proximate a rear portion of the frame assembly;

a tag axle; and

a fuel tank supported by the frame assembly and positioned in the gap and behind the rear axle and between the rear axle and the tag axle, wherein the fuel tank is supported by the frame assembly by a support structure connected to the first and second rails;

an operator cab supported by the chassis; and

a heavy-duty truck body supported by the chassis, wherein the body is spaced rearwardly from the operator cab and includes components configured for a vocational operation.

14. The truck of claim 13 , wherein the support structure includes at least a first lateral support member extending between the first and second rails over a top portion of the fuel tank and a second lateral support member extending beneath a bottom portion of the fuel tank.

15. The truck of claim 14 , wherein the support structure further includes a third lateral support member extending over the top portion of the fuel tank and a fourth lateral support member extending beneath the bottom portion of the fuel tank.

16. The truck of claim 14 , wherein the support structure includes multiple mounting structures, and wherein the multiple mounting structures include front and rear lateral support members connected to and extending between the first and second rails, the front lateral support member supporting a front location of the fuel tank and the rear lateral support member supporting a rear location of the fuel tank.

17. The truck of claim 13 , wherein the fuel tank has an inlet and the first rail has an opening positioned proximate the inlet and passing completely through the first rail, wherein a supply conduit passes through the opening and is in communication with the inlet.

18. The truck of claim 13 , further comprising a second rear axle, the fuel tank positioned behind both the rear axle and the second rear axle.

19. The truck of claim 13 , wherein the support structure includes at least a top support member extending laterally between the first and second rails over a top portion of the fuel tank.

20. The truck of claim 13 , wherein the tag axle is configured to be selectively lowered to support the chassis.