Hi !
Welcome to IRV2! We're sure glad you joined the gang!
You can weigh it at most any truck stop, then go the Goodyear website and look at the inflation chart for the G670 tires. I would add 5PSI to their recommendations.
I bought the TireTraker system. They have a lifetime warranty, user-replaceable low-cost sensor batteries and at the time the lowest cost for a system with 10 sensors and a booster/repeater for the rear of the MH.
Good luck, happy trails, and God bless!
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Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD