Rex,
The reason most of the tank cars out there, including mine, are so low is that unless you run a huge rear tire, the rear end hangs so low that the tank cant come up any higher. you could always notch the bottom of the tank, but that would kind of defeat the purpose. If you raise the tank for aero, you also raise the CG.
Stainless,
Yeah I did mount the rack to the chassis, but steering is still in the experimental phase. I did think about mounting it on the axle, and use a slider shaft to eliminate the bump steer, but with the space available it just worked out better that way. The thing that i hope will save me is that in my experience, with enough leafs in the cross spring, there is only about a half inch of trravel. I just got the chassis on wheels today, so i will check the bump steer situation and let you guys know how it turns out.