A 5th wheel RV trailer has the wheels towards the center of a long heavy box. This allows side to side movement at the front and rear. Landing gears aren't made to eliminate this type movement.
My 18 lb bi pod pin stabilizer can only eliminate side to side movement at the front where its used. My bi pod will work from 37" up to 60".
Then common sense tells us something will have to be added to the rear of the trailer. I found BAL telescoping stabilizers work great for that.
Also fore and aft movement/wiggle needs to be addressed. I found adjustable chocks between the tires work for that part. Now I'm rock solid per my needs.
Or invest in a system like the JTs that does the same thing.