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[A/S] Re: new tires
Don.
The correct Goodyear Marathon size for your 31 foot Airstream is
ST225/75R15.
The load range is important.
If your trailer has steel wheels and you have been using 6 ply (load
range C) tires for an extended period of time, you must stay with that
rating. If you increased the rating to "D" tires, you will split the
wheels, as per every wheel manufacturer.
However, if your trailer had the "D" rating tires, then by all means
replace them with the "D's".
Do not inflate the "D" tires to maximum pressure (65 psi) as that will
give the trailer a very rough ride.
Andy