User Tag List

Reply
 
Thread Tools Rate Thread Display Modes
Old 05-14-2004, 04:43 PM #1
GARunner GARunner is offline
Junior Member
 
Join Date: Apr 2004
Posts: 13
GARunner is an unknown quantity at this point
GARunner GARunner is offline
Junior Member
 
Join Date: Apr 2004
Posts: 13
GARunner is an unknown quantity at this point
Question tire pressure when towing

Is it a good idea to increase rear tire pressure when towing a heavy load? In my case, I will be towing a fully loaded U-haul 6' x 12' trailer (1800 lbs empty). I have checked around on several web sites and only became confused. Most people were talking about tires which have a max pressure of 35-40 psi. I have the Dunlops which have a max pressure of 51 psi.

Also, since I have the four wheel drive V8 would I need to increase the front tire pressure as well?
__________________
2004 Sport 4WD V8
Titanium Metallic
Side/Curtain Airbags
Sunroof
Back seat drivers X 2
GARunner is offline   Reply With QuoteReply With Quote
Old 05-15-2004, 03:40 AM #2
aj884runner aj884runner is offline
Member
 
Join Date: Jan 2004
Location: Ontario Canada
Age: 51
Posts: 121
aj884runner is on a distinguished road
aj884runner aj884runner is offline
Member
 
Join Date: Jan 2004
Location: Ontario Canada
Age: 51
Posts: 121
aj884runner is on a distinguished road
If the trailer is loaded properly there should only be about 100 pounds max on the tongue of the trailer and therefore you will be able to run the recommended tire pressure as stated on the door. If you have alot of tongue weight you should run all the tires up to max pressure. That is just my opinion and others may say differently.
aj884runner is offline   Reply With QuoteReply With Quote
Old 05-15-2004, 11:13 AM #3
Brewster Brewster is offline
Member
 
Join Date: Dec 2003
Location: Texas
Posts: 71
Brewster is an unknown quantity at this point
Brewster Brewster is offline
Member
 
Join Date: Dec 2003
Location: Texas
Posts: 71
Brewster is an unknown quantity at this point
The tongue weight should usually be between 10% and 15% of the loaded trailer weight. The 4Runner manual recommends 10%. This shouldn't overload the tires at the standard recommended pressure. However, I added about 2 to 3 pounds all around when I towed recently. With a 51 psi max you have plenty of headroom.
__________________
Brewster
2004 white 4WD limited V8
Brewster is offline   Reply With QuoteReply With Quote
Old 07-15-2021, 11:53 AM #4
RaymondHat RaymondHat is offline
Junior Member
 
Join Date: Sep 2019
Location: Argentina
Posts: 2
Real Name: RaymondHatJQ
RaymondHat is on a distinguished road
RaymondHat RaymondHat is offline
Junior Member
 
Join Date: Sep 2019
Location: Argentina
Posts: 2
Real Name: RaymondHatJQ
RaymondHat is on a distinguished road
ðšñ‚ð¿ 25,ðšñ‚ð¿ 40,ðšñ‚ð¿ 63,ðšñ‚ð¿ 100,ðšñ‚ð¿ 160

Ктпн 630 (Ктпн 630ква)
RaymondHat is offline   Reply With QuoteReply With Quote
Old 07-17-2021, 11:54 AM #5
Ascole Ascole is offline
Member
 
Join Date: Dec 2017
Location: Seattle
Posts: 125
Ascole will become famous soon enough
Ascole Ascole is offline
Member
 
Join Date: Dec 2017
Location: Seattle
Posts: 125
Ascole will become famous soon enough
tire pressure when towing

where are you towing? If it’s gonna be hot, tire pressure will increase a decent amount of psi as you go. I’ve lost truck and trailer tires due to over inflation and heat soak from the highway and actually tend to deflate my rear truck tires and trailer tires slightly when driving in the southwest.

My 4runner tires are set at 36 psi @ 60 degrees so When the tire reaches 100 degrees they’ll be close to 40 psi. Pretty sure my D rated Duratrac max psi is 60lb but there’s no way I’d want to be close to that. I tow a smaller teardrop with a weight of about 2200lbs and I don’t adjust my tire pressure, mainly because the tongue weight is only around 200 lbs and weight is properly balanced. Probably wouldn’t change that even if my trailer was heavier.

Last edited by Ascole; 07-17-2021 at 12:05 PM.
Ascole is offline   Reply With QuoteReply With Quote
Old 07-17-2021, 11:59 AM #6
JLTD JLTD is offline
Member
 
Join Date: Apr 2013
Location: South of Denver
Posts: 497
Real Name: Mike
JLTD has a spectacular aura about JLTD has a spectacular aura about JLTD has a spectacular aura about
JLTD JLTD is offline
Member
 
Join Date: Apr 2013
Location: South of Denver
Posts: 497
Real Name: Mike
JLTD has a spectacular aura about JLTD has a spectacular aura about JLTD has a spectacular aura about
My standard load tires felt squirmy while towing, until I put them at their 44psi max. That made them feel more normal. Brought the fronts up to 44 also, since under braking they are subjected to a higher load.

Yours are max at 51? You may have to play around to find the best psi for your specific situation; but I'd start somewhere above 40.
__________________
Between outfits.
JLTD is offline   Reply With QuoteReply With Quote
Old 07-17-2021, 01:38 PM #7
Ripper238's Avatar
Ripper238 Ripper238 is offline
Member
 
Join Date: Jun 2019
Location: CT/NY
Posts: 974
Ripper238 is just really nice Ripper238 is just really nice Ripper238 is just really nice Ripper238 is just really nice Ripper238 is just really nice
Ripper238 Ripper238 is offline
Member
Ripper238's Avatar
 
Join Date: Jun 2019
Location: CT/NY
Posts: 974
Ripper238 is just really nice Ripper238 is just really nice Ripper238 is just really nice Ripper238 is just really nice Ripper238 is just really nice
Quote:
Originally Posted by GARunner View Post
Is it a good idea to increase rear tire pressure when towing a heavy load? In my case, I will be towing a fully loaded U-haul 6' x 12' trailer (1800 lbs empty). I have checked around on several web sites and only became confused. Most people were talking about tires which have a max pressure of 35-40 psi. I have the Dunlops which have a max pressure of 51 psi.

Also, since I have the four wheel drive V8 would I need to increase the front tire pressure as well?
With truck tires its not so cut and dry.

What's your tire rated at? C i would guess? What is your load index?

This is what i did to make sure i met the important points.

I went with C 112Q rated Duratracs.

4R RGAWR (rear) = 3439 lbs /2 = 1720 lbs (no load) per tire and since 112 load index = 2469ea at 50psi i can run the C 112Q rated Duratracs at ~38+ psi and exceed the actual no load RGAWR still. If i need additional weight capacity i just bump up the air pressure and get up to the full 2469 at max capacity of each tire exceeding the stock required load index. Though i wouldn't want to go to max PSI for high temps or really long trips.

So far ~38-41 PSI (front and rear) has been fine with the 4R loaded up on my C rated with a 112 load index Duratracs.

Last edited by Ripper238; 07-17-2021 at 01:55 PM.
Ripper238 is offline   Reply With QuoteReply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Low Tire Pressure Warning Light On/Off mtnrunner 4th Gen T4Rs 7 07-12-2022 02:52 PM
Tire Pressure Warning Light? OdinWiski Maintenance/Detailing 4 03-08-2008 09:04 PM
Proper Tire Pressure Info Whoknows Engines / Suspension / Wheels / Tires / Audio / Accessories 1 02-18-2006 07:09 PM
Product Review: AirMan tire repair system Thai Maintenance/Detailing 0 10-15-2004 08:16 AM
How do the tire pressure transmitters stay powered? Iowa4Runner 4th Gen T4Rs 8 04-25-2004 07:55 AM

Powered by vBadvanced CMPS v3.2.2

All times are GMT -4. The time now is 05:42 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2024 DragonByte Technologies Ltd.
Feedback Buttons provided by Advanced Post Thanks / Like (Lite) - vBulletin Mods & Addons Copyright © 2024 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Lite) - vBulletin Mods & Addons Copyright © 2024 DragonByte Technologies Ltd.
***This site is an unofficial Toyota site, and is not officially endorsed, supported, authorized by or affiliated with Toyota. All company, product, or service names references in this web site are used for identification purposes only and may be trademarks of their respective owners. The Toyota name, marks, designs and logos, as well as Toyota model names, are registered trademarks of Toyota Motor Corporation***Ad Management plugin by RedTyger
 
Copyright © 2020