The main gear is a dubro, fiber type, wide stance and yes went to great lengths to keep the cg correct even bought a balancer.  I am hoping that the wheels will not offset the balance that much.  Pretty good at balancing so I will just have to correct it.  Either going to be a three inch or four wheel.  I think the lesser will work.  Also going to recheck the  throws on the elevetor and set as per manual.   Thanks guys.   gphil