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There is another way to look at vehicle certified GAWRs for RV trailers. It’s more prominent now because of the RVIA (binding on their members) recommendation for all RV trailer tire original fitments to provide a 10% load capacity reserve above the vehicle certified GAWRs.
Using the RVIA 10% minimum load capacity above GAWR for 7000# axles would require a minimum designated tire size ST235/85R16, LRF rated at 3970# @ 95 PSI. Reducing that GAWR to 6500# would bring the tire size down to ST235/85R16, LRE rated at 3640# @ 80 PSI.
See the $$$$$? It's one of the reasons why Keystone has always stuck to minimums with GAWR values. The other being, it's legal for them to do so.
No, I haven't said much about the OPs truck. It's not going to work and there is no good way to say it. GVWR is the ultimate limiter.
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