I built Norm's clamp cart last year and it has been
a pleasure. I don't have it on wheels, but positioned
it so that I can access front & back. The great thing about
it is that it will hold 6 footers all the way down to
jorgensens & spring clamps. Everything is in one
Before the cart, I had them hanging on the wall
on a 2x4, but this was a real PITA and some clamps
did not conform (like quick clamps & small spring
claps). Some would fall off at times.
Anyway, for the cost of a few pieces of lumber
and a few hours, it is definitely worth considering
a clamp cart.