Installing 50 Amp in garage

I don't keep the motor home at my house. I occasionally park it in my driveway for a few days if I need to load a bunch of stuff or really want to give it a good cleaning. During this time of year it's not too bad but during the summer in Florida its really hot. I have put several hours on my generator just to keep it cool inside when I am working in it. I keep in plugged into a 15 amp circuit which is enough to run the fridge and lights but obviously won't run the AC units. Putting the plug outside would require more labor and work for the few times a year I park it in the driveway.

Thanks for all the suggestions and advice.