Originally Posted by 2dabeach
Airstream Owners Manual for 2007 25' Safari with ST 225/75 R15 tires specifies 65 psi cold pressure. The ST 225/75 R15 Goodyear Marathon has a load capacity of 2,540 lbs at 65 psi. If you drop the pressure to 55 psi the load capacity drops 10.6% to 2,270 lb load capacity. If you drop the pressure from 65 psi to 55 psi on a four wheel trailer you woud be dropping the total load capacity by 1,080 lbs. I don't think that someting you would want to do.
2270 pounds per wheel times 4 is 9080 pounds.
That is far more than a 25 can weigh, super loaded.
The 65 psi, is ok, if the trailer is at maximum weight.
If it's not at max, then that extra air pressure will give the trailer a rough ride, causing problems.
Airstream does not write their manuals. A publishing company does them.
We strive to help customers to be kind to the trailer, instead of beating it to death, with excessive tire pressure, no running gear balance, super heavy duty tow vehicles along with hitch bar ratings for the Queen Mary.
We stay rather busy, putting those trailers back together again, because of them being abused, by all the heavy duty stuff.
And by the way, insurance companies do not cover long term damages, especially those caused by everything associated with the trailer that's in a super heavy duty category.
Again, we offer our help where it may be wanted.
If an owner insists on the super heavy duty everything, that is certainly their choice, even though Physics says otherwise.