Hi Brooks,
Everything available helps to some degree all by itself, Everything in combination will help a lot. It is very hard to say if one upgrade by itself will make enough difference. That is why when there is a handling issue, people like myself create a list in priority. If you want to do one at a time, do it in that order. If like me, just spend $2000 installing the list of items yourself, and make the rig handle as best as possible, as soon as possible.
1) Put in the proper amount of air in your tires, per the load carried during a trip.
2) Get a front wheel alignment with your rig loaded as if on a trip.
3) Replace your rear stabilizer bar with a heavy duty version
4) Replace your front stabilizer bar with a heavy duty version
5) Replace your shock absorbers with heavy duty Bistein RV versions
6) Replace your stock steering stabilizer with a heavy duty version
7) Add a rear trac bar
I have no personal experience with Sumo springs or air tabs. They might also help. All I know is that items 1 thru 7 together, are very effective for our particular rig
HERE. Not only from passing trucks, but the suspension upgrades also improve handling and control, especially appreciated when driving on curvy mountain and canyon byways. The upgrades keep all six tires better planted on the pavement for improved handling and braking. Regardless of where you are driving, the suspension upgrades also reduce driver fatigue and improve passenger comfort.
It is also worth mentioning that none of the upgrades I had done affected the harshness of ride. Our rig always drove a bit harsh until I did
THIS. I understand Koni-FSD RV shocks can also improve the quality of the ride, but they are quite expensive.
