50 amp RV? That is 12,000 watts... May as well get a built in generator or trade for an RV that has one.
Considering the small size of your set up and objective I recommend a pair of Honda 2000, parallel kit and an extended run fuel tank.
http://www.wisesales.com/eu2000i-companion-package-honda-generator.htmlhttp://www.wisesales.com/bergs-dual-feed-extended-run-tank-for-honda.html$2,300 and you are good to go all day and night.
Do verify generator hours (if any) at your place of interest.