We dry camp every chance we can--and have an onboard generator, right under the bedroom. A lot depends on what you want to run and level of comfort needed. We do not camp without power hookup if it is going to be too hot to sleep w/o the gen. Yes, its noisy, but livable--just don't want to sleep right above it, nor want to sleep near a running internal combustion engine of any kind.
2 eu3000i in parallel, sitting on a stout carrier at the rear, might be an option.
2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired