[Melissaandcrew]

Hmm…If you still have the cart(s), I would have someone take a look at it and what happens when he is using it-like someone with an engineering background.. If he is up ending the cart, there has to be some way to balance it out(think training wheels). Perhaps some sort of “pole” on either side preventing it from rolling over. ..or even weight it down to some degree to stop the bouncing..Poor guy! and poor you! Its got to be stressful for all involved.