Harbor freight? I have bought their dollies (the floor kind with 4 casters) to move engines and transmissions and they hold up pretty good, they're cheap and I think they have a heavy duty version
I've used the "Winco DLR-18 Round Dolly, 18-Inch" on my 20 gallon and 44 gallon Brute containers for years and they've held up. I buy them off of Amazon -- from whichever seller has them the cheapest. I have paid @$20-25 each for them.
Thanks for the replies. I have a harbour freight square dolly, i dont like that the weight in on the long thin pieces of wood instead of the thicker carpeted pieces, but i use that one for my smaller brute for salt water.
just ordered the winco, says its good to 400lbs.