I carry my RB stuff in a metal tool box.. standing on it would be no problem.. it's very strong n can take the weight, but I have never had to do that witm the upside down n sideways method.

Prisms are nice, and I do use mine alot, and it is nice for curing the flip m reverse viewing. It also gives you a bit of height as well but the trade off is the weight n off balance, making the camera top heavy.

Prisms are fairly cheap from KEH.. maybe $40 Bgn.