The master smitg I'm apprenticing from has an old champion forge, that was a bit bigger, with a remotr hand-cranked blower. But someone got clever, and stripped a yard tiller down to only a handle, wheels, and frame, then welded the forge on top of it :P Just tilt it back 15 degrees, and you can roll that forge anywhere. Pretty cute.
I picked up a small rivet forge just for taking with me to Fur Trader Rendezvous, and maybe some Renaissance faires. I'm still rebuilding the blower though, have to weld a crack in the cast :/