My coach was hard to handle. I took it to a shop and wanted the front end alignment done, Steering stabilizer, new shocks, oil change, flush and new fluid and filter to the transmission. They said well that's a pretty good list but they wanted to do an inspection of the chassis and see what did and did not need to be done.
Turns out front end alignment was done, they said the shocks were fairly new the steering stabilizer was fairly new and the transmission had been serviced because it had an after market filter on it.
They did find that the dash air conditioner compressor was leaking Freon. So I had that replaced.
So I had a front end alignment, oil change, dash air repair and they aired up all the tires to the correct pressure.
All shops do not try to rip you off. The rig did drive better after they were done.
I still had the 'tail wagging the dog' thing going on when passed by big rigs or in the wind.
I installed a rear track bar by SuperSteer. Now the coach drives like a dream.
Coach is 2003 Holiday Rambler Vacationer 34' with 34000 miles with the 8.1 gas motor and Alison 1000 transmission on a W22 workhorse frame.
This should be enough information to get you going in the right direction......