Chris, You would need to be mindful of a slide-out being near the side you are lifting and lift real easy.
I remember a guy who came into the shop with a cracked corner at the top rear drivers side of the slide-outs frame, including the filon.
He tried to level it on the drivers side rear just behind the rear axle . The entire top corner at the roof-line split. From the roof down to the slides top right corner as you’re looking at it.
I never liked the design of slide-outs in RVs, there is no headroom for a substantial header.
Imo, from what i have seen , the slide-out is a weak link in an RVs wall. Maybe not so much on a “million dollar plus” Prevost chassis where it would have more room to beef up the build , but not on an average class C. You would need to be careful to not tweak the frame.