Recommended. Switch hot water to GAS. Switch refrigerator to GAS. Maintain only BASIC loads. No heaters. Make believe you're camping.
Buy an electrical cord adapter and a KILL-A-WATT meter. Plug the meter into a FIFTEEN AMP circuit at home This will keep you honest and protect the meter from overload.
Pretend camp in the rig over the weekend. Friday 1800 hours to Sunday 1800 hours.
Note the TOTAL kWh as registeted on the Kill-A-Watt meter. Write it down.
Then come back to this forum for a discussion, after posting your total kWh that you wrote down.
This isn't pure guesswork. It gives a fundamental rough idea of how much power YOU use not someine else.
Just don't try and outsmart yourself and severely disrupt the way YOU think YOU will be camping. Toying with lifestyles is a sure recipe for error. Pretend you are camping :) :) :)