I have a 2012 model, the sealing where the outer wall meets the top of the slide was very poor from brand new. I applied Eternabond tape to the seam, haven't had a problem since. This will be the third summer that the slide has been out for the whole season.
2012 Jayflight 28 BHS
2014 F150, 5.0 L, 3.55 axle