There is no ladder attached to the rear of our new 2013 Windjammer 3008W. I didn't think of it at the time of purchase, but, wonder if it is an option. If not, how do your get on top, a ladder I suppose. I see rear ladders on many RV's.
2013 WJ 3008W
2006 Silverado 5.3
A ladder to the roof is very common option or standard equipment on some campers. You can order on and have it installed at the dealer, but it needs to be verified that your camper has backing plates in the location of the ladder to attach it to the wall. The backing plates are installed when they fabricate the exterior wall and are required for any component that is mounted to the wall.
The dealer (or you) should be able to find out by contacting Forest River with your camper's VIN.