I just bought a used 2004 Winnebago Sightseer 30B workhorse chassis. As I drove it on the highway I struggled to keep it in one lane. I've read so much I'm now confused. The last advise was to replace...
Years ago I had the problem on 27' motorhome and bought wider wheels for it. That was a manufacturer who did just that. Going from 90psi in "bicycle size" tires to 50psi in wider wheels make whole World of difference.