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Old 06-26-2016, 05:18 AM   #1
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Trailer tire pressure

Checked tire pressure and all 4 were at 35lbs from last year. They look ok but max cold pressure on tires is 50 lbs. That seems too hard--any comments ? Also had a new hot water tank [Atwood] installed and I'm waiting for a manual, meanwhile , the pilot shuts off from time to time and can't figure why.
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Old 06-26-2016, 06:24 AM   #2
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Here is the link to Atwood and you can down load the manuals for your hot water heater.


Water Heaters - Atwood Mobile


You don't give any info about you camper size or weight, but I am one of those that go to max and run that pressure on the side of the tire.
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Old 06-26-2016, 06:31 AM   #3
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I keep my tires at about 60lbs which is what the tires say
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Old 06-26-2016, 08:36 AM   #4
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Thanks for replies...Will check the Atwood link and fill tires to recommended pressure.
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Old 06-27-2016, 06:40 PM   #5
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If they are ST tires, they should always be at max pressure even when not at max capacity.
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Old 06-27-2016, 07:25 PM   #6
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If they are ST tires, they should always be at max pressure even when not at max capacity.


I did not know this. Since my ST tires call for max pressure of 50 psi and I don't fill the trailer to its max weight I've been running about 48 to 49 psi in them. Guess I need to bump them up to 50 all the time.
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Old 06-27-2016, 10:44 PM   #7
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I don't think you'd be harming them at one or two PSI below max. ST tires are made differently enough from LT or P tires, and for conditions that LT or P tires are not especially designed to handle, that require them to be at max pressure. If you are interested you can do an internet search for ST trailer tires interply shear.

For they record, I am not a tire engineer, but there is at least one that is active on the IRV2 forum, and that is where I have gotten my info from.
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Old 06-27-2016, 10:53 PM   #8
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How old are your tires? They age out before they wear out. As has already been said, you should run ST tires at the max.pressure stated on the sidewalls.
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Old 06-27-2016, 11:00 PM   #9
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According to what I've seen the trailer tires should always be run at the pressure given on the sidewall and that is the maximum pressure unlike some truck tires.
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Old 06-28-2016, 10:47 AM   #10
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The RMA says any tire that is 20% below the vehicle manufacturer's recommendations for Original Equipment tire pressures is in a "run flat" condition and should be inspected for internal damages.

The correct tire inflation pressure for your trailer’s Original Equipment tires is found on the tire placard, federal certification label and in its owner’s manual.
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Old 06-28-2016, 12:04 PM   #11
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Until the OEM tires are replaced with non-OEM tires.
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Old 06-28-2016, 05:46 PM   #12
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LT tires.... (light truck) guidelines are suggest air pressure for a given load... no a max pressure like what is branded on the side of car tires... if you are running ST or LT tires I suggest you go to the specific tire web site and consult the tire pressure guide for your specific brand and design of tire... thus you have the current specification...

In addition I carry a infrared temp gauge... $30 at harbor freight... at most rest stops I do a walk around... my truck has 19.5 commercial tires... when the outside temp is under 100* the tires are always 110* +- maybe 5... when its 110 outside the tires are usually around 130* .... MY 235/85/16 LT Michelin trailer tires always are in the 125-140* range when its under 100* and usually in the 140-155* when its over... I've also noted that the trailer tires will be 10-15* warmer on the sun side than the shade side... the truck commercial tires are always the same...

So I wish I could find that quality that's built into the 19.5" in the 16"

These are my personal thoughts... BTW I also check the hub (bearings) drums (brakes) and sometimes the rotors on the truck looking for consistent temperatures... if all the hubs, or drums are at the same temp, they must be doing the same work....
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Old 06-28-2016, 09:33 PM   #13
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According to what I've seen the trailer tires should always be run at the pressure given on the sidewall and that is the maximum pressure unlike some truck tires.
Goodyear published a document for those that wanted to run 65mph rated trailer tires at speeds up to 75mph, inflate the tires to 10psi beyond what the sidewall says. Here's the link.
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Old 06-28-2016, 10:36 PM   #14
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It should be said that the recommendation for running those particular tires from Goodyear at higher speeds by using higher pressures can only be applied to the particular tires mentioned in the PSB. Apply that to any other tire at your own peril.
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