I was thinking more along the lines of an 6"-8" wheel in back with casters in front, I have pictured in my head what i have seen in alot of shops and its like an axle thru the back with casters in front but i cannot find any pics and i have the big wigs up front convinced it would be benificial to move the feeder instead of the whole damn welder around the shop!
I have tried Lincoln, miller, Ebay and a few other places and cant seem to find any pictured!
We also dont use plastic we use the metal ones for holding 50 lb spools. and if your back wheels are wider than the feeder and have a low profile they wont tip over.