I visited toward the end of August. It's a really isolated park, if you want to fish or play on the water, the lake looked great. The park extends across the highway for hiking, etc, but it was too hot for me to explore.
The sites along the lake were VERY MUDDY when I was there, and not one was flat and level. The interior sites are nice and grassy. I took a nice large corner space and was able to pull in sideways, that was with my station wagon, with a truck, probably not enough room.
The "porkies" or Porcupine Mountains are about an hour's drive North on Lake Superior, if you like hiking.
When I visited, I was coming home from the west, so I was on 28 already. The roads were in good shape, but limited services.
I would not trust the online reservations system for this park, when I visited, the DNR website showed the park very full, but in reality there were very few campers.
2013 KZ Sportsmen Classic 200, 20 ft TT
2020 RAM 1500, 5.7 4x4, 8 speed