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 > Tow Vehicle Tire Pressure

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trailer_newbe

Tucson

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Posted: 07/14/19 07:26pm Link  |  Quote  |  Print  |  Notify Moderator

When you air them up to their max, remember to account for heat. Aired mine to 77 PSI (rated for 80 PSI max). Coming back from a camping trip the display showed they were 88 PSI. Pulled over and lowered to 80 PSI. Account for heat!!!


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MARKW8

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Posted: 07/14/19 07:57pm Link  |  Quote  |  Print  |  Notify Moderator

trailer_newbe wrote:

When you air them up to their max, remember to account for heat. Aired mine to 77 PSI (rated for 80 PSI max). Coming back from a camping trip the display showed they were 88 PSI. Pulled over and lowered to 80 PSI. Account for heat!!!


You, DON'T account for heat. The engineers have already done that. You always set them cold. If they are at correct pressure, the heat buildup is normal. Now, if one gets low that will create excess heat that can raise the pressure to the point of a blowout.

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Posted: 07/14/19 08:20pm Link  |  Quote  |  Print  |  Notify Moderator

Door on mine says 36. I run 40F 45R towing or not. Only time I might air down would be if the off-road conditions dictate.


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3inCoquitlam

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Posted: 07/14/19 09:45pm Link  |  Quote  |  Print  |  Notify Moderator

One of the first things I did was change out my factory P rated tires to LT (BFG KO2s). I run them at 65 when towing, back down to 35 empty.


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Rustycamperpants

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Posted: 07/15/19 12:08am Link  |  Quote  |  Print  |  Notify Moderator

I always run more pressure when towing my TT based on the recommended tire pressure chart that was shared on this site at one time.


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Grit dog

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Posted: 07/15/19 01:02am Link  |  Quote  |  Print  |  Notify Moderator

To the OP, yes you can and likely want to air up, some, when loaded or towing and air down for empty driving.
No, you don't have to account for temperature....or altitude, in general.
You have no need for 80psi on a 1/2 ton, unless you overload it by about 2000lbs. However load range E tires are a safe, versatile long lasting choice for tires on a 1/2 ton.
If your truck shakes with high pressure and not with low pressure, it most likely ain't the tires, it's the hard tires exaggerating another issue. (Bad shocks, bad ball joints, etc)


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Grit dog

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Posted: 07/15/19 01:05am Link  |  Quote  |  Print  |  Notify Moderator

SidecarFlip wrote:

I always run the recmmended pressures listed on my door pillar, loaded or empty, in my case, 65 psi in the front, 80 in the back. I never exceed those presssure ratings. The engineers who designed and the people who built my pickup know way more about what is correct than I do.


This actually makes no sense. The engineers that designed your tires also rate their load carrying capability vs pressure from about 35 psi up to the max. Not going to hurt anything running considerably more pressure than needed, except maybe your teeth and kidneys, lol.

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Posted: 07/15/19 04:22am Link  |  Quote  |  Print  |  Notify Moderator

You bet I lower the rear tire pressure when I am not towing / hauling... door pillar says 75psi - for maximum load/towing. When the truck is empty that pressure gives quite a rough ride.

I don't change the air pressure daily. If I am going to be doing a lot of towing, I keep them aired up. If I will be empty for awhile, I air them down a bit - usually to 65psi.

A lot of different information out in the internet, but I check tire pressures in the morning, when the tires are "cold". While traveling I keep my eye on them, and check them if something looks off - but I don't air up or down if all the tires are roughly equivalent pressure.


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TurnThePage

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Posted: 07/15/19 08:13am Link  |  Quote  |  Print  |  Notify Moderator

Too bad the original poster didn't specify more info about their tow vehicle. It certainly sounds like a 150/1500 series. Unlike 250/2500 and above, half ton trucks are most often tuned for comfort, not work. 35 PSI is a great pressure for daily driving, not for towing or hauling. I increase my P rated tire pressure to the sidewall max when towing, which greatly increases stability, and probably improves long term durability, through less heat build up too.


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myredracer

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Posted: 07/15/19 10:08am Link  |  Quote  |  Print  |  Notify Moderator

nagel wrote:

Do others increase / decrease the tire pressure in their tow vehicle when they are pulling the trailer? My truck specs say 35 psi for all 4 tires, but nothing about adjusting when towing.
What are you towing? Something short & light or long & heavy? Must have a 1/2 ton? P rated tires aren't very good compared to E rated, esp. as you get into longer and heavier trailers. For towing you want stiffer, not Cadillac soft. 35-40 psi is Cadillac soft and will result in more sway/poorer handling.

Recently got a '12 GMC Sierra 2500. Sticker says pressure should be 80 psi on the rears and 65 front. I'm using 75 psi on the front.
We put a set of LRE Goodyear Wranglers on it which have stiff sidewalls with a kevlar belt. We tow a 29' 7K lb TT. The truck tows the TT as if it was on rails. Zero sway. I never thought towing could be so good!

Had an F250 for 7 years, towing the same TT. It had LRE Michelins on it and ran 80 psi rear & 75 front. Sidewalls are a lot more flexible compared to the Wranglers. I thought that towed pretty good, but wow, the Sierra tows so much better. Difference has to be in the tires and maybe the heavy duty trailer package on the Sierra.

When I first got our F250, I experimented with different pressures on the front & rear tires and settled on the 80 rear & 75 front for best handling & sway control. Can't recall what Ford said the psi should be but was a fair bit less than this. Some people are shocked at running such high pressures but only downside is maybe a harsher ride which doesn't bother me in the slightest. I reduce the pressure over the winter months.

FWIW, tire pressure in a TV is just one of a number of factors to consider when looking at reducing sway and improving handling, and they all work together as a "package".


Gil, Deb & Dougal a 15 year old Springer Spaniel
2014 KZ Spree 262RKS, Reese DC WDH, shocks and Endurance LRE tires
2012 GMC Sierra 2500HD crew cab, Bilstein shocks, heavy duty trailering option


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