I have my Cougar on a seasonal lot when I'm not on the road. The campground only has 30 amp service, so I added a 20 amp outlet on the kitchen slide, along with several outlets - 1 for the fireplace, and another above the counter to run my coffee maker, induction cooktop, etc. Works great. When I'm on the road, I look for 50 amp hook-ups, but I still have the option to use the extra 20 amp outlet.
Here's what I installed:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
The attachment below shows what it looks like on my camper.