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I would get tires for the GVWR of the trailer, at least with the same weight rating of the existing tires. This allows that even though you might not be carrying at the GVWR, it's so you can if you have to. The hard part is that the tires on the axles will have less weight rating that what the GVWR says since, the tires DO NOT typically carry all the trailer weight on the axles and tires and some part of it (10% to 25%) is on the pin and therefore the truck. Generally speaking the difficulty is that ST tires will have better rating than LT even at the same time because of "the reserve". Hopefully someone else will be able to explain "reserve".
Well, it's just best if LonnieB (the resident MOC tire guy) would just come online to recommend the size/rating for your trailer and stop all of us from trying to guess how to help you.
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