In July I had one of my rear dual tires blow. My old Goodyear tires were 7.5 years old. I found a new set of Bridgestone tires with a manufacturing date of April 2012. My new tires were around 3 to 4 months old when installed on my rig. I noticed a big handling change with the new tires. My RV tracked with every rut in the road and the bow wave of a passing truck almost pushed me off the road. I put on a steering stabilizer and a rear trac bar. My front end already had a front trac bar. It helped some but my RV was still somewhat more difficult to drive then it was with my old tires.
In November we left Washington State and headed south for warmer weather. The last time my RV tracked badly was as we approached Tucson, AZ. As we headed home in the spring my RV was driving better and better. By the time we reached Redding, CA my RV was driving better than it ever has.
I posted my story on line and some have said that they have experienced something similar with new tires. Apparently, in my case, my tires needed to age, or needed miles to break them in, or perhaps both.
I am now very happy with the handling characteristics of my RV. It has never driven better.
JD & Kathy and our pom "Mac"
2016 Winnebago Sightseer33C built on a 2016 F-53 Chassis
2009 Saturn Vue