We got the Bridgestone Alenza ULTRA A/S on the 20" T6 wheels we have about a month and a week ago. They're replacing a set of Michelin Premier LTX that made it 40,000 out of their 60,000 miles warranty. Thankfully my tire dealer gave me a credit back which I applied towards the Bridgestones. I've been very impressed with them thus far due to comfort, road noise, lack of vibration and comfort. All a significant improvement for us over the Michelin Premier LTX and Scorpions we had before those. We've put about 3,000 miles on the tires since we got them due to multiple summer road trips. In rain they've been quiet and secure. On dry roads they've been fantastic. I highly recommend those Bridgestone Alenza Ultra A/S for anyone running the 20" setup we have! Hopefully they get close to their 80,000 mile warranty.
You have a ton of miles, has your suspension ever been replaced?