Chassis dolly/casters?

http://www.eastwood.com/autobody/rotisserie/body-carts.html

Take a look at some of these and you might get some ideas of your own.

Personally, the one I'm working on bolts into the front spring hangers for the rear with just some square tubing for coming down and a plate to bolt the caster to and for the front is a piece of plate bolted in on each side where the K-frame bolts in with more square tubing coming down like the rears. I'm still working on material so it hasn't come together yet, so no pics at the moment.

http://www.autotwirler.us/catalog/popup_image.php?pID=61\')