"ginagary".....What does your hitch look like? Are you using drop down hitches, extensions for the tow bar, etc. My sister bought a new coach and had to add several components to get everything down to the proper height. On their first trip, as I followed, they Jeep was moving side to side a lot. It didn't do that before on their previous coach where they didn't need extensions and drop hitches.
Make sure all of your hitch components are locked up tight and not moving around. Roadmaster makes a "U" bolt shaped lock for keeping the hitch equipment quiet and from moving around. A 1/4" - 1/2" side to side slop at the hitch can translate to a lot of side by side movement by the Jeep. Get someone to follow you.