Dave
Bring your slide all the way in and than inspect the top (roof part) of it. I had my AF for about a year and than one day I happened to inspect the top and I found one of those recessed ceiling light lenses laying up there. It was apparently left up there by one of the employees. Im sure over time if that would of placed itself in the right position, it could of caused a problem. If a foreign object is up there, you wont know it till to find it.
2009 Silverado 3500 dually D/A, Supersprings, Stable Loads, Bilsteins, Hellwig Sway Bar.
2010 Arctic Fox 1140 DB, 220 watts solar, custom 4 in 1 "U" shaped dinette/couch, baseboard and Cat 3 heat, 2nd dinette TV, cabover headboard storage, 67 TC mods