Here's a carry-all I fabbed, recently. It's made mostly from 2 inch receiver hitch stock. It's built to support the clay bird thrower and its battery, but the plan is to be able to remove the thrower, and put a plywood box on top for tools or rocks, or whatever.
http://i290.photobucket.com/albums/l...0563_small.jpg
http://i290.photobucket.com/albums/l...0565_small.jpg
It sits on pneumatic wheels from Harbor Freight, but they're not there to carry the loaded weight. The upper link pin is made from some W1 stock I had.
Now, I just need to get the bird flinger fixed. It doesn't work, right out of the box! Thanks, Do-All!