I have a 40' 3 slide camper, and have had no issues with some preferred sites but not all of them. We did premium this year, but last year the original preferred site I was assigned too was too shallow to fit the camper much less the truck and camper. I ended up with the same preferred site in the 300 loop as the previous year that fit the camper, but I had to take the truck to overflow as there was not enough room for it and the golf cart. Since I had the golf cart it was not an issue for me to do that. This past February I stayed in a premium site 400 loop, the site was easier to get into and could accommodate the truck, trailer and cart without issue. We are doing premium again for the August trip with my GFs children. I chose that because it is easier for her to spot me into the site then a preferred would be, plus the extra elbow room will be nice.