Diesel pusher with no 50amp plug-in?

I did a 50 amp hookup myself at my brother in law in rehobeth Delaware when we visit there in the hot of the summer... I plug right in and have water from the outside....I was just at their northern NJ house and we were there dry camping for 5 1/2 days...Using inverter, auto gen start and the temps were in the high 40's to about 60....had fans on to vent...really didn't have to run heat pumps except one night...I ran generator twice daily about 3 hours a time..kept the batteries up and fridge was on propane just fine..Came home with about 1/8 tank fresh water and pretty near full black/grey tanks...dump station for all of five bucks at the Allentown Pa turnpike service area...and we were good to go...remember to look up the legend of what you need...the two sides are 120v and the top is neutral and the bottom ground...it looks like a dryer outlet but wired totally differently.