I try staying in the center lane unless it's a two lane Interstate. In areas where 18 wheelers are prohibited from the left lane I keep right as the middle is their passing lane. For us RVers driving 65 mph the right lane can cause some white knuckling with on ramp merging traffic, that's why I prefer the center lane. Bumpy roads are just a part of towing adjust if you have to or just live with the situation.
2016 FC 25RTB
2016 Nissan Titan XD Cummins Diesel