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Ray: Various threads through the year(s) (and on this and other forums (RV.net for one) on this topic -- basically all say the same thing -- changing tires, springs, etc., does not change the placard on your door. If you are overweight, you are overweight and need to look at a bigger Tow vehicle. Now, that said, looking at the Goodyear website, it actually looks as if going to the bigger tires will decrease your weight carrying capability. As for the speedo - yes, larger tires will mess with it but your local dealer should be able to recalibrate it using their diagnostic tools. Another however, however, while doing a little researching on your question I ran into two other posts where upgraders stated that going to larger tires actually decreased their take-off power -- larger tires equated to a larger rear-end gear ratio -- one post stated 'much like going from 4:10s to 3:73 rear gears!'
In that particular post the poster commented about his high end cruise speed stayed the same (70 - 75mph) but his RPM decreased from 2000 to 1850 or so.
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