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Discussion Starter · #1 ·
I have the BFG TKO2 tires with my 2018 TSS 4x4 5.7 Tundra. I am towing a 8000 pound camper as well as a dirtbike and generator in the bed. My tires came aired up at 50 psi all the way around and I aired them up to 60 psi. Did i go high enough with my psi to tow this much weight or should I go higher. I want to say the max cold psi is 65.

Thanks in advance guys!
 

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What’s the tongue weight of the trailer? 800lbs?


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Discussion Starter · #3 · (Edited)
720 pounds

the dry weight is right at 7000 pounds and I rounded up 1000 pounds for all the crap I have in it plus water.
 

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Did i go high enough with my psi to tow this much weight or should I go higher. I want to say the max cold psi is 65.
What size tire?
 

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Discussion Starter · #5 ·
265-55-R20 I think. I am at work and wont have a chance to go see for a while.
 

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265-55-R20 I think. I am at work and wont have a chance to go see for a while.
I'm going to assume 275s since 265s would be smaller than stock.

They are rated for 2680lbs at 65 psi, total of 5360lb on the rear axle, which I'm pretty sure is more than 2x what you actually have. So 60 psi is definitely plenty. I'd go 50 psi and only bump it up if the rear end feels squirrelly.
 

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Discussion Starter · #7 ·
I'm going to assume 275s since 265s would be smaller than stock.

They are rated for 2680lbs at 65 psi, total of 5360lb on the rear axle, which I'm pretty sure is more than 2x what you actually have. So 60 psi is definitely plenty. I'd go 50 psi and only bump it up if the rear end feels squirrelly.

Thanks rruff i really appreciate it and your right, it is probably 275. When i purchased my truck it came off the lot with 50psi on all 4 tires. What psi should i run during daily use?
 

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Toyo calculations are perfection, if you can get your head around it. I for one and NOT a fan of the chalk test. Totally unscientific and assuming.

Start with max load and max air. 2680lbs at 65 psi. So 60/2860=0.02272727272 Now how much weight on each tire? I think, rear curb weight is about 2300lbs plus cargo and tongue weight so another 1000lbs. Round up for fuel tank and whatever and call it 3500lbs. divide by two tires times the factor from above 3500/2=1750 x 0.02272727272 = 39.77272726

I got this from a Michelin Technical Engineer so, don't shoot me. I've been using it for many, many years.

So, 40 lbs is fine for proper contact patch but, you can stabilize the rear when towing by adding a bit more. I would suggest running 50lbs for all around ride comfort and traction.

Remember also, you are NOT adding weight to the front when towing a trailer. You are more likely removing weight so, don't make the common mistake of adding air to the front. This will only serve to reduce traction and steerability and increase center tire wear.

My2CT
 
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