The easiest way is to use a portable.. Or two
Honda, Yamama and several other INVERTER generators you can get optional Parallel Kits. two Honda 2000i's (The i means inverter) give you a full 30 amps with the parallel kit or a 2000i and a 200i-companion (the companion is more expensive but the parallel kit is cheaper as part of it is built into the Companion) You can also use them independent.
Honda's have the optional extended run tank as well Far as I know they are the only ones that have that feature.
You can store 'em anywhere you can store 'em Just be sure to lock them down both in use and storage so they don't grow legs and walk off,