My G670's have been fine too - replaced the fronts last year and the rears are due now at 7 years and 58k miles.
The G149 is designated a "Regional Service" truck tire by GY bit they also say it is "suitable for Class A motorhome". The design is a simple, straight deep rib, excellent for channeling water out from under the tire. I would have no qualms at all about using that tire.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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