Originally Posted by switz
Airstream, for whatever reason, supplies four GYM ST225/75R15D tires on the tandem axle trailers (or two on the single axle trailers) plus one as a spare. They have to be responsible that the tire will do the job or there would be a huge liability exposure.
If the load capacity of the tires they mount are equal to or exceed the axle capacity, and if the GVWR of the trailer is within what the sum of the axle capacities and the tongue weight, then Airstream has met the requirements, I would think.
If the tires fail, I would guess the majority of the burden lies with the tire manufacturer, as it is they who tell Airstream that their product meets the desired specs for use.
From a corporate level, at least some of this is about risk management, and they ( GoodYear and Airstream ) know there are going to be "some failures" in the field. Some of these failures may be user error ( overloaded, underinflated, overspeed ) and some may be due to manufacturer defect. It's why the tire company has a warranty, etc.
What amazes me about the whole thing is why many folks defend the whole ST tire scenario. Why should we accept a product that limits us to 65 mph and has to be replaced on age alone in three to five years when we can instead use a tire ( LT in this case ) that has a 100 mph limit, giving us a potentially larger margin of safe operating envelope, and which has a ten year lifespan ( according to Michelin ).
I'm just not seeing why I should have any love for a ST.
With all due respect to the poster who commented, I suspect Airstream
has thought long and hard about all of this, as evidenced by the fact they fit Michelin LT to some of their trailers as OE and make it optional on others. Sounds to me like it's simply about dollars....as in more dollars of profit for them if they can get a consumer to accept ST at the normal selling price of the trailer. And then when you do option the bigger wheels and LT tires, even more profit, as they are essentially double charging you for wheels and tires, as the option price is nearly what it would cost you to go out and buy the 16" upgrade after you get the trailer home.