Lots of snake oil examples for RV stuff out there for ex.: Lippert sells an awful of electric 'stabilizers' for trailers... Sounds like a good idea until you have them and find out awful they are at stabilizing. Not to worry though because Lippert sells stabilizer struts for your stabilizers! They get you once for the pricey stabilizers and again for a fix but even the fix can leave some wanting better stabilizing and you've gotta add screw or hydraulic jacks in addition. :M
If you want to use a slide stabilizer, I'd make darn sure that the frame is firmly planted to the ground in as many location under the frame as needed. Pads or blocks under frame supports (scissor, elec. stab., or other jacks) should not rest on sod or loose soil that can settle. Even then, as per others, don't think it's a good idea. You might find that if your frame is well supported, you won't need a stabilizer for the slide.