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Old 11-03-2015, 10:41 AM   #1
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Aframe Tire Pressure

Do you guys run the air tire pressure at the recommended psi on the tire sidewall? Or do you have other factors you consider? I have a 2014 a122s with the small tires.. they were "nitro filled".. I'm probably going to use free air.. what do you think?

2014 Rockwood Premier A-122S
2013 FORD F-150 STX, Super Cab
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Old 11-03-2015, 12:35 PM   #2
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I run at max cold tire pressure as shown on the sidewall. If I am checking the pressure on an extremely hot day, I will air up a couple of pounds less than max.
I also tow about 58 mph with those small tires.

Joe in NH
2016 Rockwood A192HW A-Frame
2013 Ford F-150 XLT 3.5 Twin Turbo Supercrew
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Old 11-03-2015, 01:13 PM   #3
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I have to look again.. I think it's 50 psi, cold.
2014 Rockwood Premier A-122S
2013 FORD F-150 STX, Super Cab
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Old 11-03-2015, 02:19 PM   #4
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I run at the tire's max air pressure (65 PSI), perhaps plus up to 3lbs. Factors I think about:

- has the tire been rolling in the past 12 hours (add some because it hasn't cooled back to cold pressure).
- am I taking the a-frame to a significantly higher or lower altitude (add some if going lower). This matters in Colorado because it easy to change altitude by 5K ft in less than a day's driving.

The only real issues with going a few lbs over max is a slightly rougher ride if the camper is loaded very lightly, and excessive wear in the center of the tread (I've never seen this on a trailer).

Since I have an air compressor at home, and the a-frame stays in the garage, I simply check and add air (65 - 68 PSI) before each trip. My trips are 4-5 day weekends at most, so I don't check the air again until the next trip.

My 2014 A122 Westlake tires are rated for 1710lbs (3420 total), and I normally trailer at 2800-2900 lbs (grew 100lbs this year with more gear). That gives enough reserve that loss of 1-2 PSI during a trip is not an issue. I normally tow at 65-68 MPH on the interstate; again the weight reserve gives me confidence I'm not likely to have a blowout.

Fred W
2014 Rockwood A122 a-frame
2008 Hyundai Entourage minivan
camping Colorado and adjacent states one weekend at a time
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Old 11-03-2015, 02:59 PM   #5
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yep 65
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2012 Flagstaff T12RB A-Frame
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Old 11-03-2015, 10:33 PM   #6
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Yep - I go at max pressure!
Gpa - Shelton, Washington

2015 T12RB
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Old 11-03-2015, 10:39 PM   #7
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Loaded with a 3 KW generator, a motorcycle, and the usual gear, I am at 3000 lbs. so I run 65 psi. If I was at 2500, I would drop it to 60.

2015 T12RBST Flagstaff Hardside
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Old 11-04-2015, 08:48 AM   #8
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In the absence of a compelling reason to run under the max pressure, I fill mine up to 65 psi cold and don't worry about it.

2012 Rockwood A122S
2008 Toyota Tundra Double Cab 4X4

Former owner of a 2002 Coleman Niagara GTE
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Old 11-04-2015, 09:40 AM   #9
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Because most vehicles have OEM tires that have yust enaugh loadcapacity to carry the GAWR's, and most Recreation-vehicles are loaded to their max in general use, you would expect AT-pressure given on sidewall.

This is what the Vehicle-makers base their advices on.

But , even if not overloaded on the axles, there can be misbalance R/L .
Then you need the pressure for the highest load on the axle.

This then is higher then AT-pressure given on sidewall , but this is not the maximum allowed cold pressure of a LT tire and Truck-tire.
Once determined of a ducument of Semperit/Continental, that maximum cold pressure of tire is 1.4 times the AT pressure.
And most tire makers in America still allow 10 psi above AT-pressure for LT and 20 psi above AT for Truck tires ( in fact a 22.5 inch tire on an RV is a truck tire to my opinion) . They even advice it for higher speed for ST tires.

So in the end you can better use higher pressure then AT- to give the tire the extra savety.

When you have weighed, and then preferably per wheel( pair) then you can determine the needed pressure more secure, but as long as you did not do that , you have to be on the save side.

I am able to calculate it for you , but need all the data for it.
Will give link to topic I made , so I wont polute this topic further with it.
Will Edit it , first have to find it.

Edit: found it , its about pressure -loadcapacity lists and and will use that topic for further calculations.

Another EDIT: tried the link and wanted to write a new comment, but could not because the topic was to old already.

So in time I wil open a new topic for it , but the text I copied and used for other topics , I will place here , so you can see what data I need for calculating.

Tirepressure advice is all about load on tire and speed ( and sometimes about alighnment - camber angle).

So if you can give details of car and tires , I can calculate an advice pressure with some reserve for things like, pressure-loss in time, unequall loading R/L, incidental extra load, misreadings of pressure scales,and misyudging of weight, etc.

This is from tires next and can be read from sidewall:
Maximum load or loadindex.
Kind of tire to determine the AT-pressure/pressure needed for the maximum load up to maximum speed of tire, or if lower 160km/99m/h/reference-pressure, wich is not the maximum pressure of tire.
Maximum speed of tire, most given as letter ( Q=160km/99m/h,N=140km/86m/h fi)

If you have offroad or tires looking like that , with large profile blocs that cover a part of sidewall, also mention, they are allowed lesser deflection then a normal road tire, then the tire maker used to determine the maximum load (to my conclusion the case for the Bridgestone tires on Ford Explorer in the Ford/Firestone affaire).
If you cant find all of it give sises of tire and Loadkind, then I will google for it.

From car next and mostly can be found on same plate as the original pressure advices:
GAWR and GVWR ( Gross Axle/Vehicle Weight Rating)
But best would be to determine the real weights in your use on seperate tires or estimate it as acurate as possible, by weighing per wheel(pair) or axle.

Maximum speed , you dont go over for even a minute in your use, eventually different for different situations, for instance when towing or fully loaded.This apart from trafic regulations, if you drive faster then allowed give that speed. Nature punnisches with tire-failure, police only with a penalty.

Give all that and I will calculate and give a picture of one of my filled in spreadsheets in my answer.
If other then original tires, indead as is already answered other advice is needed, a stiffer tire ( fi C-load instead of P-tire) needs a higher pressure for the same load, or the other way around, has lower loadcapacity for the same pressure.

Greatings from a Dutch pigheaded self-declared tire-pressure-specialist.
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Old 11-05-2015, 11:00 AM   #10
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I am the original poster. . My tires on the a122 are indeed labeled 65 psi, cold. I checked the pressure this morning before hitching up. 46.5 in one, 48 in the other. So i need about 17 lbs or so in each. That's cold. So, I figure I will drive the 5 or 6 miles to the air pump. Check them again. My question.. even though the tires may warm up and show a higher pressure at the air pump, because of the drive... I still add 17 lbs. Right?

2014 Rockwood Premier A-122S
2013 FORD F-150 STX, Super Cab
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frame, pressure, tire, a-frame

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