Originally Posted by GAT
I can't seem to get an answer about proper tire pressure from the people that installed my 225/75/15 D range pressure. They put 40psi when I picked them up. Three months latter when I got ready to tow I went back to see the recommendation and they told me to go up to the rating on the side wall which is 65 psi. Who knows what is correct. I plan to tow over 1000 miles for my first real trip next week. Thanks for suggestions.
The correct tire pressure also depends on the load.
"D" tires are maxed out at 65 psi, for the load of 2500 pounds plus, per tire.
But, when they are inflated with "air" that pressure increase with temperature. That in itself, can cause a tire to fail, should it get hot enough.
A better inflation media is to use "nitrogen".
If the trailer will be at a moderate load, then 55 to 60 psi is plenty.
Also, to keep the tires from getting a hot spot due to scuffing, the running gear should be properly balanced and kept that way. Some owners add balancers such as Centramatics, which keeps the running gear balanced from 25 mph and up.
If the Airstream has 3 or 2 piece hub and drum assemblies, it's also wise to check them to make sure one is not way out of balance as they are, all too many times. Centramatics would not help that situation, and a rebalance would be often required.
The old 3 or 2 piece hub and drums, are sometimes found to be as much as 3 pounds
out of balance.