[sdcantrell56]

As long as your frame is stiff, you will be perfectly fine with 1/8" drop. You can use 6 traction wheels with this and you will be able to turn well and have great pushing power. If you want to use omni wheels then you do not want any drop at all. I am a fan of all traction wheels for more power and so that all of the wheels are the same for replacing them if something goes wrong. Either way you go just remember it is either a drop of the center wheel with all traction wheels or omnis with no drop, never both.