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When contemplating increasing the load capacity of the replacement tires the limiting factor is the wheels PSI limit. Some of their manufacturers rate them with max load capacity and a PSI limit. Others just rate them for the load they can carry which includes the PSI necessary to carry that load.
When the trailer manufacturer selected the wheels and OE tires for your trailer it was for their ability to carry the maximum load of the GAWRs. The GAWRs have not changed so the wheels are good to go as long as they are rated for the increased PSI. The valve stems could very well be rated for 65 PSI and would have to be replaced. Steel valve stems are the best replacements.
The extra load capacity the new tires will provide is; “load capacity reserves”. It’s one of the best durability factors one can purchase with replacement tires.
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