getting trapped inside a park

We went to a COE park in Ga. Called before I made reservations, park host said no issues with a big rig. Made to or site, no issues. I walked down to look at the turn around area and didn't see how my 40' fiver would make it. Short turn around, trees, sloped to outside of turn. A guy across the street had a big toy hauler about my size and to get to his site he had used the turn around. I asked how he did it. Said to go in the out loop and then take my truck off the pavement onto the grass going toward lake as much as I could and make sure I had bed rail clearance as it sloped off pretty bad. Said to make sure and watch trailer swing because of 1 tree that didn't have alot of bark left on it that people hadn't watched. Said when I got up to the site that was in the corner to pull the marker sign out of the ground to give myself more room to pull truck around. Came the morning to leave and it rained during the night making the grass where I was to pull slick. I figured this was a sign from above that I didn't need to use the turn around which I really wasn't thrilled about trying. I ended up backing out over a 1/4 mile.