Our TM came with the 14" Goodyear Marathon tires. We purchased the unit from a private party in 2004.
This link will give you more information:
http://www.trailmanorowners.com/foru...52&postcount=2
Since 2004 we have traveled to AZ and back 8 times for a total of approximately 70,000 without a tire failure. I replaced the tires with another set of 14" Marathons in 2007 and again in 2011 (also replaced the steel valve stems and balanced the tires).
Based on my experience, I will continue to purchase the 14" Marathons. We tend to hear from owners who have experienced tire failure. It would be nice to hear from owners who have
not experienced tire failure.
Dick