With or without the engine running? In cold weather? What does your users guide say about it?
Most slides are connected to the house batteries. If you have help, you can have them press and hold the AUX start switch and parallel the two battery sets while pulling in the slides for extra oomph.
Once on a cold (~34F) morning, my 25 foot slide wouldn't even start to retract. The motor was humming along like normal, it just didn't seem to have the oomph to pull in the slide. It would certainly try, I could tell that, but it couldn't make it up that lift section (flat floor slide). I wasn't ready to start the engine so I grabbed the edge of the slide near me and pulled, and danged if that didn't give it just enough help to get it started, and then the system did the rest.
So that taught me the backup method of pulling in the slide. Which worked out fine after I had 2 of the hydraulic valves replaced a couple years later (one of them I broke the release, the other the shop insisted had to be changed when that one was changed --- which turned out to be total B$). After a full year, the air in the hydraulic system had worked it's way out so the problem went away, but that first year I'd have to *assist* the slide by pulling on the wall behind the driver while reaching over to the dash to press the retract switch.
Dunno your rig as well as you do but even if the slides are electric only, perhaps pulling on the edge would help get them all the way in easier. Give it a bit of assistance. So would starting the engine I'd wager.
But it's best with slide issues to check with a shop.
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