I have spent hours inside, outside and under our PC2100 wondering what could be done with the design to make it handle better, ride higher and not have tail drag. The answer is not much without changing everything we love about the unit--good turning radius, rear kitchen, short height, narrower than most width. Make the wheel base longer and that effects turning radius. Also, as Ron said, if wheel wells are relocated that really messes with the design and if the floor is raised, then the unit gets taller which we don't want. The wheel base being so short there is not much room toward the cab for the 3 liquid tanks which create tail drag. We put air bags on top of the springs (makes ride a little rougher) and had the drag wheels put on the trailer hitch for tail drag. We did ad other things (heavy shocks, anti sway bars, etc.) There is another thread on the forum that discusses improvements many of us have made.
All that said, I would buy the PC 2100 again in an instant knowing it would need some additional work to improve handling.