Sept of 2015 I seriously considered spending $$$ for a new set of tires for our 2011 Passport 250BH. The tires were original and even though, according to the tires, were 6 years old and had nearly new tread depth. After reading all the stories about blowouts I just about spent the money. INSTEAD, I had the axles aligned, bought a TPS and filled the tires according to the weight on them, 45 PSI.
Packed up and left October 5, 2015 and as of now have traveled 14,000 miles keeping the tires properly inflated and keeping our speed about 55-60 MPH. The good news is the tires show almost no unusual wear and very little tread wear. The bad news is ............... I'm not home yet.
Hope by keep doing what I am doing I will get many more miles from these tires. The TPS system money has been little more than peace of mind since the tires have had no problems. I did save a lot of bending over and checking tire pressure. Got it mostly to alert me of a rapid air loss and hopefully prevent damage to the trailer in case of a problem.
I guess I just got the set that had no early problems, or I
a. Drove speeds within tire limits
b. Kept them properly inflated
c. Had the axles aligned
d. Inspected weekly for any unusual wear
e. Avoided curbs and potholes
f. Got lucky?
Safe travels to you all and with proper care and awareness you can keep problems to a minimum. Now, moisture and leaks, well, that is for another place on this site.
Tom