Yeah, sounds to me like air bags would help a bit. I think I know what you're experiencing. When you go over variances in the road it can feel like the truck and trailer do a little tug of war as each set of wheels sequentially hit the same bump. I don't see that ever going completely away. However, my airbags do help relieve it. I've experimented with mine and right now 30psi seems to provide the best overall fix.
Jeff & Sandi (and Teddy - 7lb Schnorkie)
2018 Montana HC 305RL / Andersen Ultimate Hitch on B&W Ball
2012 RAM 3500 Big Horn Crew Cab 4x4 SRW / AMP Power Running Boards