I thought the 18SB was a hybrid, not a FW. But no matter, it’s still small. Going from memory, which can be dangerous for me, if you use a generator they’re not allowed in Tower, Slough, Pebble Creek, Lewis Lake and Indian Creek campgrounds. Slough is a couple of miles from the pavement, has about 30 sites, and I seem to remember is mostly tents. But a good place to see wildlife. If you want 1st party info you can always check their website or even call the park. A great place to visit, have a nice trip.