When I ordered our 2016 Ford F53 Winnebago Sightseer I had the dealer add a Safe-T-Steer, Roadmaster rear sway bar, and a Roadmaster trac bar.
My coach is 34 feet long and it came with 22 inch tires.
It drives much better than my 2005 F53 with 19.5 inch tires.
I'm not sure if the tires make a difference but driving the 2016 is much easier than the 2005. For the most part I don't feel a push from 18 wheelers. I get a little push from box trucks. Driving in wind isn't bad up to a gusty 35mph. It tracks well going down the road. One hand driving is an option but I usually use two. White knuckle driving in construction zones is greatly reduced.
Free things or inexpensive things that may help.
A lot of people swear by the Cheap Handling Fix.
Weigh coach on each corner and overall.
Set your tire pressure to the load on your front and rear axles.
Make sure that weight (cargo) is distributed. You don't want the front axle too lightly loaded.
Next, if you still have a problem, add a trac bar. A trac bar will help tail wagging when a truck passes or when driving in windy conditions.
Lastly, consider a sway bar. A sway bar helps to control roll when the MH is pitching side to side. For example when pulling into a gas station with uneven pavement.
