I have a Coachmen FE 276rkds. I added 2 Bal scissors stlye jacks. 1 on each side about 3 foot in front of axles. It helped a good amount but still has a little bounce. As stated above I dont think you will eliminate all of it.
I now own Coachmen #5 and have never had 1 issue requiring warranty work. There has been a few small issues. I have taken care of them myself.Been camping off and on for 35 years.
I wish more people would give it up.....Just kidding. ...We now go during the week sincewe both are retired...Really loving the COE parks in Alabama and Georgia...