Tony, while I agree with most of what Brent says, I'd keep the rears at the 51 pounds. I believe that year Tundra has a maximum hitch capacity of 500 pounds and you've obviously gotten to that point or more. With the 'tail wagging the dog' that comes with a single axle trailer, I wouldn't let the sidewalls have any more flex than necessary.
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Jim in Memphis, Wife of 51 years is Brenda
2019 F450 6.7 Powerstroke
2018 Mobile Suites 40RSSA
2021 40' Jayco Eagle
2001 Road king w/matching Harley sidecar
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