If you can't run temporary power for whatever reason (which seems like the best option), maybe you can find an a used Onan QD10000 somewhere. Those are $10K new, but I know someone that bought a wrecked Class A cheap just to get the generator, he had to replace the housing, but otherwise he got a diesel generator with 200 hours on it for $1000.
Those Onans will run for thousands of hours without a problem as long as you keep the oil changed, the diesels can go 200 hours between oil changes, so you'd "only" need to change oil once a week.
If you can get away with storing your fridge+freezer somewhere else (maybe a neighbor will let you put them in his garage), then you may be better off adding some batteries either inside or outside your RV to give 24x7 power, and use a smaller generator during the day when you're home to run your computers, etc and top off the batteries. So maybe you can get a much cheaper 3000W inverter generator (which will keep your computers happy with their clean power).
Size the batteries so you don't drop below 70% charge level and you can get years of use out of them. With the money you're saving from not buying the big diesel generator, you can add some solar to help keep the batteries topped off.
