Originally Posted by Brian B-P
An interesting item from the Basecamp's specifications:
That 55-series size is common for SUVs, but very surprising for an ST tire. I can't find it in Goodyear's website. Either Airstream had Goodyear make a special model for them (which is possible given a large enough purchase commitment), or Airstream is using a different type of tire for this model. In that size, if it's not a special ST, it is likely a Euro-metric (so 255/55R18, with no "ST" or other letters in front) in an XL (Extra Load) rating.
This tire size is suitable for a 3500 pound capacity axle, and is a couple of inches taller (in overall diameter) than the ST205/75R15 used by Escape.
I submitted a query to Airstream about the tires, and received this reply:
Thank you for your interest in our new Basecamp model. I have included a link to the specific tire for you below. Should you have any additional questions, please let us know.
https://www.goodyear.com/en-US/tires...ViewSizesSpecs - Specs24
Scroll on down to the 255/55R18 tire.
The Goodyear Assurance CS Fuel Max is an all-season tire usually used for SUVs; it is not an ST (Special Trailer) model. This particular tire spec is a Euro-metric size in Extra Load version:
255/55R18 109H XL
load capacity 2,271 lb @ 50 psi