Youtube usually has descriptions about slides. Lippert has service manuals on-line that details info on their slides including maintenance and adjusting. So you can watch youtube and see how it lines up with the manuals. If yours is not Lippert look up the company and see if they have on-line manuals.
2015 Flagstaff 32IKBS
2008 F350 6.4
1999 Palomino Filly Popup (my daughter's now)