We have a Salem 27RKSS 2013. We were thinking about getting stabilizer for the slide. Went to our local dealer who said that Forest River does not encourage this under as "The slide out uses the weight of leaning on the trailer to seal, putting a brace under it usually will push the upper seal away from the wall of the trailer allowing water to get in if it rains".
This is our first slightly used trailer with a slide so we are banking that our sales person at our local dealership knows what he is talking about.
The other thing I do is check with people to see if this is what they have found and/or concur with sales.
Any and all information will be taken into consideration. BTW, we did cancel that part of our order as I put the cart before the horse so to speak
Dave and Gayle