2018 24ft Sunseeker E450 w/158" WB. I had one installed and it made a significant difference while being pushed in tight turns towing my toad 4-down. It also helped with crosswinds, being overtaken by semis traveling in the same direction as well as trucks traveling in the opposite direction on 2 lane highways.
For the install, the mechanic used my hydraulic levelers to lift the rv then jack stand it for extra safety.
I used a SuperSteer ss450 track bar.
It might be a tight fit if you have certain air bags, like a side mounted bag.
I first installed the track bar then installed a set of Wireless One by AirLift bags with a compressor which did fit because the bag installs on top of the spring pack not on one of those side mounted brackets.
I also added at a later time, HD Hellwig sway bars front and rear plus a steering stabilizer. Its hard to say which offered the most bang. If you were going to install one item, I think the rear track bar made the biggest difference in my case. The sway bars were the icing on the cake which made the package a total joy to drive but maybe I would feel differently if I had installed the sway bars first, who knows.
As a side note for info: After 4 road tests I ended up removing the air bags. They didn't work out, the wireless system malfunctioned constantly .
My reason for adding them, I was looking to raise my rv 2-3" in order to clear driveway aprons because the rear overhang was dragging in my home driveway.
Air bags will raise a sagging rv back up to normal but are very limited to raise a normal riding rv to a higher than normal level, 90-100# only lifted my rig an inch. It was not enough to justify that expense. That system installed was about $1500.
Hope this info helps, good luck and stay safe.