First, the hosts were great. They came down and chatted with us about our Teardrop and then also shared their story of their campers. They suggested a couple places to visit. This is a campground that is made for 5th wheels and big RVs so they made us feel comfortable with our TD. The location can't be beat. We did Rushmore, CrazyHorse, Custer Park, Black Elk Peak, Wind Cave National park and some just piddling. It is right across the street from the lake. There may be better places, but this was perfectly located.
We had a wonderful time at this campground! It's located across the street from Legion Lake and the Legion Lake Lodge and Cabins. About 20ish sites with electric hook-up. Level Concrete pads for RVs, Campers and Vehicles. Clean Drinking water easily available but not at each site. The farther back in the campground you go the more wooded it is (sites 8-15). Bathrooms were very clean, the showers were warm-hot, even during peak bathing times. The hills up from the sites gave the kids a "natural playground" to spend their free time on. Also close to all the scenic drives Custer State Park has to offer, 15 min from Custer, SD (which has some very tasty restaurants) and about 45 min from Mount Rushmore. Campground was full of everything from huge RVs to small 2 man tents, empty-nesters to families with young kids.
We stayed at a Legion Lake cabin in Custer State Park. The cabin was fantastic - comfey beds, kitchenette and private bathroom. But the area around the cabins and along the lake shore is recovering from construction, so you may want to give the grass some time to grow. It's pretty brown around the cabins currently. The lake is still lovely though, and Custer State Park is full of views and wildlife as always. One of my favorite places.