20 amp should be fine, unless you want to operate your microwave and a/c together, these 2 items are you biggest electrical uses, otherwise you will be fine.
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Jim
Sometime life gets in the way of living.......
If you have the electric option for the water heater shutting it off will help, or, at least waiting until it shuts down before using any other high draw appliances.
We were staying at my son's house last summer in Florida. I was plugged into his 20 amp in the carport. AC worked fine mostly,but would periodically trip his breaker. I thought I had turned off everything. Turned out it was the water heater. Turned that off and the AC worked the rest of the visit.
Dick
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2015 Escape 5 TA
2016 Ford F-150
Not too much chance both the AC and the electric heater would be on at the same time, anyway.
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2017 Escape 5.0 TA
2015 Ford F150 Lariat 3.5L EcoBoost
2009 Escape 19 (previous)
“Most folks are about as happy as they make up their minds to be.” — Abraham Lincoln
If you have the water heater with the electric element turn it off, an option some trailers have. Follow what Jim told you and you will be ok. Campground electrical hook up is not that difficult to do or figure out.
Chuck