Am hoping someone may be able to help me.......I have a 2011 Keystone Montana 3150rl. It has Lippert 2.5 hydraulic slide . Its the 13 foot slide that when I bring it in or out about the first 8 inches it scrapes the roof in one corner ...tears up the seal. I tried adjusting the vertical but cant seem to make any difference. Thought maybe someone else may have run in to this ?