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Unread 08-18-2010, 10:23 PM   #1
billzcat1
Chicken in a Turkey Suit
2003 WJ 
 
Join Date: Oct 2008
Location: Redmond, WA
Posts: 8,537
Tire Pressure for Towing?

Question for the Gurus: My girlfriend is about to tow a U-haul trailer across the country. Tow rig is a 2003 WJ Overland. I'm not concerned about the rig handling the load - realistically its about 3000 lbs so it shouldn't be a problem.

The owner's manual doesn't mention a change in tire pressure for towing or heavy loads. Normally I run 2psi over factory recommended because I like it a little firmer. Any recommendations on tire pressure for towing? Tires are the stock size 235/65-17.

Thanks for your help!

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Unread 08-19-2010, 01:58 PM   #2
Nickell80
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1997 XJ Cherokee 
 
Join Date: Aug 2009
Location: Tucson, AZ
Posts: 310
I can't think of a number for pressure but if nothing else with the trailer loaded just fill them up until they aren't squatting real bad. But don't go over the max pressure. That's the best answer I can think of. lol
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Unread 08-19-2010, 07:34 PM   #3
wilson1010
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1999 XJ Cherokee 
 
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Location: Cincinnati Ohio
Posts: 1,765
Tongue weight should not be much more than 10-15% of trailer total weight. 3000 lb Uhaul = ~400lb.

Check weight rating on tires and make sure that another 400lb on the rear wheels is not to much. Then, air up until you get out the squat like last poster said. Not more than max pressure on side of tire.
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Unread 08-19-2010, 10:38 PM   #4
thantos858
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1974 CJ5 
 
Join Date: Jan 2005
Location: Santa Maria
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Just run the max pressure and make sure to check it with a accurate gauge. I would also check it before the start of each day after the tires have cooled enough to not give a false reading.
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Unread 08-19-2010, 11:46 PM   #5
billzcat1
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2003 WJ 
 
Join Date: Oct 2008
Location: Redmond, WA
Posts: 8,537
Thanks for the advice! I am sending her with an MV50 compressor and my Longacre gauge so she can fill it as needed.
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Unread 09-02-2010, 08:43 AM   #6
horatio102
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Join Date: Mar 2001
Location: Alger, WA
Posts: 1,452
She shouldn't have an issue running at normal pressures, 5-over would be good. No real need to go to max pressure if the rig isn't overloaded. I towed a ~3500 pound trailer multiple times in my '99 without airing up the tires and they didn't hunker down at all. Hell, I towed a '79 F150 on a flatbed trailer and the tires did just fine (granted, they were 33x12.5 mudders).
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Unread 09-02-2010, 12:58 PM   #7
billzcat1
Chicken in a Turkey Suit
2003 WJ 
 
Join Date: Oct 2008
Location: Redmond, WA
Posts: 8,537
Well, she ran them at 40psi (max is 44) and had no troubles... except as they warmed up, the TPMS started sounding alarms every 60 seconds due to "over recommended pressure" when they reached 45psi warm. So she aired down to 38psi (which, coincidentally, is 5-over) and had no more problems. Thanks again for the advice!
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