I'm about to install a ladder on my Rockwood 8272S TT. First, I called Forest River parts dept. with my model# & Vin #. From there, I got the part # & called the plant manager for Rockwood, & he looked up my trailers' vin information to verify backing was installed so a ladder could be added(it could). Next, I talked to the service/installation manager at the factory to verify the position of installation. Even though I'm alittle nervous drilling pilot holes to start the screws into my trailer, I'll be sure to put silicone in the holes so water cannot penetrate in. Now that being said, ladders can be alittle pricey, but I would(or your dealer) order from the factory only for a correct fit, and not a generic fit-all. And shipping can be pricey, but luckily my ladder can be shipped in 3 pieces, lowering cost. Talk to the factory with your model & Vin# to find out for sure.