As promised, Here's a photo of my CPC 1100 tripod dolly constructed from 3" x 1" aluminum channel. Makes for a light weight, sturdy and rigid ride. Definitely saves the back!
If you'd like to make one yourself, e-mail me at rigelsys.com and I'll send you the instructions pdf file. Takes about 2 hours.
McMaster-Carr can ship the aluminum channel to your doorstep. An 8' length costs about $50 delivered. Part number is 9001K41
Wheels are 3" polyurethane from Harbor freight ($6 each or so)
Bolts are 5/16" diam, 3/4" long stainless steel.
Photo shows color after dropping it off to have it anodized orange :-)