Towing psi

Sorry for another psi post... wondering what psi people are towing with? I have a stock 2020 Sport manual with OEM 17” Toyo A30 tires.

Towing a travel trailer about 3600 lbs. Payload on the truck will be close but still under.

Door jamb says 29 psi, tire says 44 psi. Psi threads people seem to be running 32 psi? I have no idea what I should be running at while towing...

Did the chalk test with just the truck and not towing at 29 psi, seems overfilled which was weird... any advice would be appreciated!

 

Can't offer any advice, just what I'm doing with my set up. 2018 OR 4x4 stock 16" tires at 32 psi whether towing or not. My tow is 3250, truck payload at 950 when towing. 3rd summer towing, no abnormal wear on the tires so far.

 

Crazy idea. Contact the tire manufacturer. I imagine if you gave them the info on the truck and trailer they could come up with a good recommendation. Remember, it's in their best interest for you to be satisfied with the tire performance.

 

Chalk test isn't that precise, especially on relatively small radial tires.

I suspect anything between 29 and 35 will be fine, but it'll feel better with a little more in it.

If you want to get mathy, you can use some math to figure out the contact patch size unloaded, then hold that constant and adjust the psi to maintain the contact patch size with the increased weight.

 

I believe this is covered in the manual.

Theorys: The load in the bed, the load behind the axle and the down pressure (stopping) load/2 on the tongue all add up to yes more pressure than empty.

Practice: Look at cold pressure ratings and increment by 2 over jam rates until squat is the same as starting. Road test. Front may be less.

 

There doesn’t appear to be one correct answer to this. I’ve researched this and can’t find any real consistency. Ive been towing numerous different boats and trailers with different trucks and tires for close to 50 years.I have never adjusted my tow vehicle tire pressure just for towing. I leave the pressure where I always have it based on the tires I have at the time. I’ve never had a flat tire or blow out on the vehicle while towing. I’ve never had any problems. No one I’ve ever known adjusts the tire pressure when towing. They just hook up and go. If I was to adjust the pressure I’d go closer to max pressure than not. An under inflated tire will run hot and then you may have problems like tire failure.
Just want to mention trailer tires. They are designed different than vehicle tires. They should be inflated to the max pressure shown on the sidewalls. If they aren’t catastrophic tire failure is a real possibility. Number one cause of trailer tire failure is under inflation. I check my trailer tires very time I tow.
I also carry an infrared thermometer. When I make a stop while towing I’ll check the temperature of the trailer hubs and the tires. If the hubs are running hot I know I may have bearing failure. I carry spares and can change them out in under an hour.