Jennifer, I run #303 and it is 45,000 GWR whatever, I have 120 in steer, 110 in drive and 100 in tag. I drive at approx. 62 mph and try and get off the road by 2PM before the usual heat of the day. I am with Wally on the tire temperature. Maybe I should pay more attention. I do change the steer tires every three years with DOT stamp of no more than six mo old. The drive and steer are every 5 years. So far so good. Also good idea to weigh coach to determine allocation of cargo and weight/stress on each axle before you travel.
Enjoy your travels.
David
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