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Tire psi when towing.

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Old Jun 25, 2017 | 01:12 PM
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Tire psi when towing.

I just bought a used 2017 Expy with the Heavy Duty Tow Package.
It has the 275/55R20 113T Hankook Dynapro ATM tires. (Max 51 psi).
The tire placard on the B-pillar indicates 35 psi all around.

Do you experts recommend adding any psi when towing?

Thanks in advance for your replies.
 
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Old Jun 26, 2017 | 06:26 PM
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I always air up when towing. I would run no less than 40psi for 300 pounds tongue or less and bump it up to 45-50psi when you get heavier.
 
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Old Jun 26, 2017 | 07:38 PM
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Thanks for the reply Randy. I run 38 front and rear when towing with my Navigator, but I haven't had this husky of a tire before. When you said 40psi, is that for both front and rear?
 
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Old Jun 27, 2017 | 12:57 PM
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My 15' EL 4x4 put 28k miles on the original Goodyears at 35psi and they were damn near bald on the inner and outer edges of all 4 tires (2/32nds), but the middle of the tires were 8/32nds. Only 2 things give you that wear, under inflated or overloaded. It never towed on those tires. I put a new set of Michelin Defenders load range E (80psi max) on it and have run them at 50psi for 37k miles and they are flat and even. I think ALL car manufacturers list too low of pressure on the door jams for even tire wear. Yes they'll handle good but I'm tired of replacing tires way sooner than I have to and running all my vehicles 5-10psi higher than the placard has given me the even tire wear I expect from a properly aligned vehicle.

When towing I bump the rears up to 65psi.
 
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Old Jun 27, 2017 | 02:42 PM
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Originally Posted by pdqford
Thanks for the reply Randy. I run 38 front and rear when towing with my Navigator, but I haven't had this husky of a tire before. When you said 40psi, is that for both front and rear?
Yes 40psi front and rear in my wife's Explorer. In my truck I run 50psi unloaded.
 
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