Thought I'd share this... I've wanted a nice mobile setup for a while, and finally went for it. Used aluminum scrap (truck drive-shafts, snow-rakes, posts, misc tubing), modified a 700-lb dolly with some large wheel-chocks, bolted on some locking swivel wheels and made two wooden platforms. It holds my argon cylinder (any size), 250EX, three-drawer tool cabinet, bench grinder, vice, and large misc bin underneath.
Then I realized my colossal mistake...
It's not green!! (I kinda just rolled with the original dolly color).
Added an abs plate for the foot of the dolly, and a heavy plastic-coated chain to secure the cylinder. Best thing is, the whole thing rolls into the back of my van.