If you are buying a MIG welder and thinking about buying a cart to set the welder on, I would like to ask, "If you cannot make a cart, what DO you expect to make with this new welder?"

My advice:  Look at some of the models shown on the web, plan out what you want on your cart (welder, gas bottle, 2 big wheels on rear, swivel wheels on front, rack to coil hose up on. basket to hold gloves and extra parts, handle to push and pull it by, etc.).

Get an old derelict metal shopping cart and start sawing it up and welding it back together the way you want it. If you plan on using it outside every once in a while, put some 20 inch bicycle wheels on the back and fill them with "Slime"(never leak). They will roll much better across grass and bumps (Wish I'd done that).

You will have a better cart than you can find from your Miller or Lincoln dealer for almost no cost.

If you can't do that, don't buy the MIG.

BE EXTRA CAREFUL WITH GAS CYLINDERS. Full  or empty, they can kill a child or pet or break your foot if allowed to fall over because the were not secured.

I am just a retired hobbyist trying to pass on good advice. 
Click the {YES} box if this has helped you.