I agree with f1100turbo, this is out third unit with slides that are in the out position way more than they are in the in position and we have never had an issue. When I inquired with our dealer on the first camper we had with a slide his response was NO do not use slide jacks, the slides are designed to hold their own weight, he said he had actually had to repair more slides from improper use of slide jacks, than he had from issues with the slides.
2011 GMC 3500HD 4x4 Crew DRW Duramax
2012 Sierra 365SAQ
2006 Police Roadking FLHPi