[Will Hanashiro]

i also would not recommend casters. four wheel drive is sufficient, six wheel drive may be going overboard. if you're looking for on-the-dime turning, why not try a trick wheel? for those of you who dont know, a trick wheel is a normal wheel, but with a whole lot of miniature discs going around the perimiter. the miniature discs allow the wheel to slide sideways, yet they provide sufficient traction for rotating foward.