I usually camp as far from electricity as I can, life is good with a 1000 watt Honda gen. Recently I had to park at a site with electric and water. They had outlets with both 50 amp parallel 4 prong 220 and I think 30 amp? 3 prong angled RV outlets. They were on the same circuit so it was users choice. I know I can go buy any variety of adapters but I have access to all the parts to build my own. I will put a good power strip with overload breaker and GFI protection downstream. Since I am going to have to build I want to cover myself. Has every campground moved to the 4 prong 50 amp? Do I need to make another splitter for the 3 prong? Any other outlets in wide use at campgrounds?