Have any of you mechanics built up a nice heavy duty tool cart? My tool chest is overflowing and very stationary. So for convenience I was thinking it would be nice to have a sturdy roll around cart with a nice solid top and maybe capable of hanging common tools off it somehow. I have a couple of the cheapy ones, but want something heavy duty that could take some serious weight. I really don't see any thing sold that I like and figure a guy could build something. Just need a plan. Any thoughts or opinions out there?