Probably no
more than a 10KVA unit, although one of my neighbors has
a trailer-mounted 250KVA unit (has a 6-cylinder Detroit Diesel on it)
that he picked up cheap at a logging equipment auction.
Anyone want to know how to run a mainframe out of your house? This is
the answer.
I've used a motor-generator set in the past. 8-)
Peace... Sridhar