Yes, you certainly can use a larger tire like the # AM32131 on a 3,000 lb axle. While we do not disagree with what the forest river rep told you regarding the "rotational mass aspect", this is generally a non-issue when upgrading tires, especially if you are well under the GVWR of your trailer. As long as the hubs you are using have the 5 on 4-1/2" bolt pattern, can support a 14" wheel, and you have enough clearance in your wheel well, you will be good to go.
Most any hub that will work... view full answer...
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