Most Army Corps of Engineer campgrounds have electrical hookups with both 30 and 15 amp outlets. I go to West Point Lake in Georgia, a Corps of Engineer lake, where almost all campsites are on the water. I then hook up my RV to the 30 amp outlet. I beach the boat, tie it off (to a tree or tent peg, etc), then use one of the 15 amp outlets to run extension cords to the battery charger. I have been to other Corps campgrounds and they are similar. It sounds like you're on a great adventure!