Here's a link that I found while I was searching for ways to better stabilize my 5th Wheel while camping....
auto levelers and 5th wheel stability - General RV Information - Escapees Discussion Forum ..... I had the same problem with our previous 18ft A-liner TT...since manufacture state that the frame was not to be lifted off the ground completely - not designed for that, I blocked with sturdier tire chocks, then thought about bracing the fram with 2x4s cut with notch to fit against the frame at an angle to help with the side to side motion... but we went to a 5th wheel recently and never got the chance to test the 2x4 thought out completely... as for the auto-levelers, I have been told, and read, that these are for basic leveling only, and not to really stabilize the movement of the trailer since one shouldn't use those to lift the tires off the ground - where most of the trailer movement comes from...the suspension system...etc. so adding side to side stabilizers to the landing gear helps some...but most reduced when I added the X-Chocks to stabilize the wheels... next I am going to add this Valterra general purpose RV stabilizer
https://www.amazon.com/gp/product/B0...KIKX0DER&psc=1 we'll see where we get from there.... also working on larger wood stabilizer feet pads so the stabilizers do not have to extend as far - I read that will help on motion reduction some as well...... no for set up, I am sold on the auto-level system, would not have it any other way - simple, mostly worry free as long as your site doesn't have too many unlevel spots, etc where the landing gear/stabilizers have to extend to far, etc... set the pad blocks, press auto level and let it do it's thing while you work other things around the RV for setup, etc...of course keeping an eye on the auto-leveling while doing so, and not touching or entering the camper while it is auto-leveling...
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