I'm going to replace the Marathon tires on my 2013 3455SA. Does anyone know if the stock wheels/rims are sufficient to handle the Goodyear 614's? I believe these are 14 ply tires and require increased air pressure.
I would venture to say they are since I did the same thing on our 2011 model. If there is any doubt, you can look on the back of the rim and it should be stamped either 110 psi, 120 psi or 3750 pounds. Either of those stamps are essentially the same. The other way to verify is to check on Tredit.com for the specifications of your particular rim. They provide pictures which are easy to match up to your rims and will provide the associated specs.
Bingo
If you have the eight lug aluminum wheels you are good to go. To be sure , you can look on the inner side of the rim and it will be engraved in one of the spokes.