I am running the Goodyear 295/80/22.5 16 ply rv tires, I did have Goodyear install 2 new fronts shortly after buying our rig a little over a year ago. The rears are the factory installed tires from 2006. They still look OK to me, but I am certainly no tire expert. I know we are pushing the 7 year time limit, but have only 40,000 miles on the rears and about 10K on the new fronts. Do you think Schwab would look at my tires and give me a report on condition, or with the age, should we just change them? While at the service center in bend last week, I ask for a quote to change all 8 tires to the Michelins 18ply. The cost was $6100.00 less a trade-in on my new fronts.