if your going to go anything different than diesel (wvo/bioD etc.) then scrap adding generator
off of a PTO. Been there, studied that. from what I've figure out by reading and asking smarter than me folk; the constant engine speeds like a gen set is where the most problems with coked engines come into play. Can be done? but will double or tripple regular maintainance to keep the engine cleaned out.
Besides it's overkill. You cold power the whole campground with the engine curve matched with the proper sized genset head.
but read yourself and come to your own conclusions.... Im just a coach.