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Bingo answered your question about the numbers but it sounds like you need a new RV tire dealer. One that is familiar with more than the popups and lightweight trailers this guy is used to. RV or not, tires come in all shapes and sizes and need to be mounted on wheels that support the size and psi. As RVs get heavier, so will the gear that supports them. With tires, the psi is a major factor in satisfying ratings assuming you have the right tire and wheel, too and it doesn't sound like this guy is familiar with larger trailers of any kind.
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