Hi Wilcut. I am not sure what handling difficulties you are having, wind whip from other vehicles, cross winds, tail trying to pass you?
You have a longer vehicle/wheelbase so your handling characteristics will probably be different than on our 31 UL
I had installed a Safe-T-Plus steering stabilizer which helps maintain the steering in my lane and returns the steering to center after a turn.
I also had installed a rear stabilizer bar which drastically reduced the tail trying to pass the windshield effect from vehicles passing me.
A long day for us is 300 miles travelling. We have found that later starts, less miles and earlier stops (for the night) help save us from over fatigue.
Good luck, Darrell