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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