19.5 versus 22.5 tires

MURPHY55347 wrote:
So I have had my Winnebago Vista 35F gasser for 3 seasons now. It feels like when driving down the road I'm constantly sawing back and forth on the wheel to make it go straight. Then factor in trucks and crosswinds and it can be quite a handful and quite tiring to drive. So far I have I have done nothing to the chassis. I read all the things that can be done to make it handle better, but I am wondering if anyone, with first hand experience, can tell me what part my having the smaller 19.5" tires might play?
What chassis upgrades aside from the CHF will give me the best bang for the buck to address my problems?

Can't be due to the tire size, as our Chevy P30 goes straight down the road with only needing your pinky for control. Naturally the tag axle helps as well, but our older one didn't have it and it wasn't a problem either.
I really think that the only reason for larger tires and wheels are for carrying more weight and for still having a decent ride on lower pressures.