If you are questioning the drivability of a gasser, test drive it first.
Last year my intentions were to get a 5er, and Dodge pickup to pull it.
However, after visiting a local RV show, (the Pomona, CA RV show), where several dealerships have at least one of each or their brand of motorhomes available to test drive, I ended up with a Class-A gasser.
All of the gassers that I test drove were built on the Ford F53 chassis, and they all generally felt the same, regardless of the 19.5" or 23" wheels.
I ended up picking up my new Thor Hurricane near Orlando Florida, and driving it home to Southern California. It's considered an "entry level" motorhome with a 228" wheelbase and 19.5" wheels on the F53 chassis. It drove so well, (perfect tracking, smooth ride, no sway), that I didn't even realize that the front tires were underinflated until I reached Tallahassee, FL. It drove even better with properly inflated tires!!
No crazy sway or drifting in strong winds. Yes, I do feel the puff of wind when passing or being passed by a 16 wheeler, but nothing out of the ordinary.
I may eventually install a Saf-T-Plus just for peace of mind if I have a blowout, but not to improve the handling.