Camden Hills wouldn't be our first choice, but we were returning to Maine to retrieve our trailer after some truck trouble, and wanted something close to where we left the trailer. Sites were pretty picked out by the time I made plans. so I chose a "Medium" site and hoped for the best.
It was tricky getting our 20' trailer into site 13. I'm not the best trailer driver (long truck, short trailer) but I do get lucky from time to time. I backed the trailer in between the trees as a neighbor laughed, trying to avoid the culvert for the stream which would have been a disaster. The truck/trailer wouldn't fit, so once the trailer was parked and leveled, I "parallel parked" the truck to get it off the road.
I had a Falcon Guide to the Maine trails, and that, along with the park map, allowed us to do a nice loop of Mts. Battie and Megunticook. In order to not block the site, we packed up and asked to park in the "overflow" lot near the park shops.
Some of the turns in the roads were a little rough for bigger trailers, but we did okay. The dump station is further in the campground, so don't try to leave and miss it. Wifi seemed pretty strong but we kept turning it off. I didn't ask about how much it costs.
Camden was a nice town; parking was problematic. The campground is about 2 miles from town, so not close enough to walk. It seemed like there were a lot of portapotties around, but that could be due to the Mt. Battie auto road traffic. We didn't try the bathrooms or showers.
Try to do your homework regarding sites, and anyone with a trailer should try to get a large one.