While you are looking, might also keep your eye open for a used Miller Bobcat engine powered welder..

I bought a Bobcat 225 years ago that is a combined 225amp AC/DC welder and 8500watt 240/120VAC for standby power.. Same unit serves both purposes...

One caveat... older Bobcats are pretty loud. If you live in a tight residential area, neighbors will probably complain about noise.