In my view you should invest in a generator. Then all you need to do is buy gas. You should get about 12 hours of run time per tank.
Can't do that? Run your water heater on propane or turn off your water heater unless you want to bathe.
Do you use a microwave? Would think that using that would really draw all your load away from everything else.
Low voltage will damage your computer, printer, and flat screen. Over time and continuous low voltage will damage and shorten the life of your AC compressor unit, if it is the original unit it's already 10 years old and typically near the end of it's life cycle if you have used it very much over the 10 years and have not preformed proper preventive maintenance.
You can always use a good quality extension cord and power up your electronic devises that way.
Your RV is not built to NEC code requirements, that's why RV builders can use under sized wiring in RVs.
