What pressure do you run when towing with E rated tires?

I just got E rated tires, 275/60/R20, Cooper AT3 XLT. It's indeed a quiet and smooth running tire, also looks good.

So I've seen the thread where one can figure out the correct tire pressure after upgrading from stock. Per the charts I only need 42 PSI to achieve the same load carrying ability as the stock tires.

What's a good pressure that's a compromise between comfort and sidewall stiffness when towing a heavy load? (7k trailer) Right now I'm running 50 PSI, thinking of bumping that up to 60 when going on a camping trip.

On my 2008 DCLB I had Michelins and ran them at 75 PSI when towing. It felt great!

 

285/75/r16 Michelin Defender E Rated

Kept at 39psi.

Any higher and I’ll lose my last rear molar.

 

I have Michelin E rated tires from Costco and they set them to 46 psi in the front and 50 in the rear to have the same load carrying capacity. When I'm towing my 6500 lb camper, I run 65 in front and 70 in back with Timbren bump stops. Drives great!

 

Thanks, that sounds like a good setup

Why set the front/rear differently? Just wondering. (I always tend to go with the same on back/front)

 

My guess is just for ride quality. I have noticed when I run 70 in the front instead of 65 when towing it does ride a little rougher.

 

High 30s/low 40s psi Will get you in the ballpark. To find out what is right for your particular truck, setup, load do a simple chalk test.

https://www.youtube.com/watch?v=W0qL20nBNRI

 

With a fully loaded Tundra & Trailer that chalk test is always going to show the entire width of the tire coming into contact with the ground. That's why both front & rear 'squat' after engaging the trailer and leveling with WDH.

When not towing the test makes more sense.

 

Chalk test is for normal operation, to give you a true baseline for PSI on your truck, load, etc. For towing, you would certainly increase pressure from baseline accordingly, especially in the rear.

 

Exactly. And we already have the thread for all that:
(ie. what pressure to run with LT tires based on the manufacturer recommendation)
https://www.tundras.com/threads/how-to-determine-your-new-air-pressure-with-lt-tires.56860/

I'm seeking feedback from those who tow with E tires. So far 65/70 seems like good guidance.