F53 come in various model years and weight sizes. Also, the motorhome manufacturer spec's the 'as delivered' chassis to them to use on different platforms. So different coaches, with the same model year and weight capacity F53 chassis, can have different levels of suspension components. So the devil is in the details on what steps may be needed to improve handling
On our 98 Bounder, with a 99 F53 18K chassis, we made the following suspension modifications:
-Koni adjustable on rear, setting 3
-Koni FSD on front
-Roadmaster Larger rear sway bar, added along with the existing stock bar
-Roadmaster front sway bar
-Super Steer SS400 Rear Track Bar
-Steering Stabilizer Safety T
-Front Davis Tru Track
-Four corner weight, and tire PSI set accordingly
-As much weight as possible moved towards the front of the coach
The T28 Bounder of that era, was a relatively light Class A. This was our first RV, used and in need of catch up maintenance when we got it. I went overkill on improving the handling, as I was trying to make the ride as secure and sure footed as possible. My DW was already nervous being in such, to her, a large rig. I also look at handling as safety edge, as you never know when you may need to make an emergency maneuver.
The handling went from my assessment of say a 4 out of a range of 10, to say a 7 after the suspension modifications. We felt much more sure footed on mountain curving switchbacks. While driving in shifty winds, and when trucks bow waves and sucking vacuum passing situations were also a bit better, they still could be 'fun'.
Adding the Air Tabs did help on these windy conditions and trucks passing.
One other factor, that probably helped them help us quite a bit. Is our 'tail overhang' was not as pronounce on many of the larger Class A's we've seen on F53. Especially the entry level models, where they spec'd a shorter wheelbase F53 and still tried to build a bit longer then practical RV. This really can add to 'tail wagging the dog' that you read about on many forums.
My main reason for posting was to thank the OP for his info sharing, pretty much match most of my results too in regards to Air Tabs. But, to also caution those with F53 chassis looking for handling improvement solutions - to understand the 'specifics' for your combo F53 and Model RV - too many variables to say one solution will help in all cases...
Travel safe, have fun, best to all,