LAdams
Northern Illinois
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Joined: 10/06/2000
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I keep the TT tires at max as I run close to GVWR on my TT... I run my truck tire pressures per axle weight plus a safety reserve...
Les
2000 Ford F-250SD, XLT, 4X4 Off Road, SuperCab
w/ 6.8L (415 C.I.) V-10/3:73LS/4R100
Banks Power Pack w/Trans Command & OttoMind
2006 Nomad 3150 Double Slide (Bunkhouse)
Hensley Arrow
Jordan Ultima 2020
HUNTER THERMOSTAT INSTALL
** NEW ** blog.rv.net
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JJBIRISH
Butler, PA, USA
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Joined: 10/06/2002
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generally speaking you won't go wrong by using the side wall pressure... that is the max PSI for the tire...
there are load charts that tell you the minimum PSI for the load being carried...
the right pressure is any where between those two numbers...
unless you weight your trailer often and know the weights on any given trip the minimum is unless to you, so the maximum is the best place to be...
Love my mass produced, entry level, built by Lazy American Workers, Hornet
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LuckeyUs
Southeast Florida
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Joined: 04/15/2006
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Thanks for all the great advice!
Kenney & Jackie
Retiring & Full-timing May 1, 2008
2007 Chevy Silverado 2500HD
4x4, Z71, with Electric steps
Hensley Arrow, Barker Jack 3500
2006 Jay Flight 322FKS
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Chuck&Gail
In the Colorado Mountains
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Joined: 06/16/2004
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I use manufacturers charts, plus 5 psi for luck, on our trailers. So far we have never run with them aired to the max. We HAVE actually WEIGHED our trailers several times so we CAN use the charts. In fact we did a 4-wheel weighing on the big one.
Chuck
Wonderful Wife
Lovely German Shepherd.
1999 Mercedes ML320 TV
2003 Wanderer 187TB Toybox (3620# UVW, 4800# loaded)
Not yet camped in Hawaii, 2 Canada Provinces, & 2 Territories.
I can't be lost because I don't care where this lovely road is going
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smkettner
Southern California
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Joined: 03/21/2005
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I go with the max. I am not going to read a chart to use 47 pounds instead of 50.
If you have up sized the tires from original then use the chart.
2001 F150 SuperCrew 5.4 Lariat Offroad 4x4 Tow Package 4.10 Truetrac
2006 Keystone Springdale 249FWBHLS
12K SuperGlide, KGE3000Ti 2.3kw rated 2.6kw max
Frank's voltage booster, Prosine 1800 powered by 4 GC2 batteries
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ogfalcon
Cibolo, TX
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Joined: 01/20/2007
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I would recommend inflating your trailer tires to the maximum inflation pressure as written on the side of the tire. This will give you the peace of mind that you can safely carry all the goodies you have loaded into your RV, especially since most RV manufacturers put the smallest (least expensive) tire they can get away with on RVs. Always check/adjust your tire pressure when the tires are cold to the touch, and always check the pressure before every outing, as all tires will lose air pressure over time.
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gheicher
Pennsylvania
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Joined: 03/03/2007
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If I inflate to max pressure when cold, the tire will be overpressure when hot. I understand using nitrogen to fill the tire will result in much less expansion than air as tire temperature rises. Thus it would seem prudent to use nitrogen instead of air if using the max pressure in the tires. Anyone use nitrogen??
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kraushad
Eastern Panhandle, WV
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Joined: 05/07/2007
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gheicher wrote:If I inflate to max pressure when cold, the tire will be overpressure when hot. I understand using nitrogen to fill the tire will result in much less expansion than air as tire temperature rises. Thus it would seem prudent to use nitrogen instead of air if using the max pressure in the tires. Anyone use nitrogen??
It seems to me that a tire manufacturer would take into consideration the increase in pressure as the tire gets hot and reflect that in the recommended pressure on the outside of the tire.
Sometimes I think we make things more complicated then they need to be.
Since I approach GVWR, I inflate to the max recommended on the outside of the the tire when the tire is cold.
Dirk
Myself (34), my Wife(32), and "The Boy"(3)
06 GMC Sierra 1500 Crew Cab, 5.3L V8, 3.42rear
05 30QBSS Trail-Cruiser, Prodigy BC, Reese Dual Cam W/D
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BurbMan
Long Island, NY
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Joined: 09/20/2001
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Here is the Goodyear inflation table:
And here is the Maxxis table for ST tires:
The right way to do it is to weigh the trailer and adjust your tire pressure accordingly. In my case, I have only 7640 lbs on 5200 lb axles with D rated tires (2540 cap ea) so I have over 10,000 lbs of capacity. I am running at 60 psi instead of 65 to provide a little margin of safety.
My loaded weight was a fully packed TT with full water, so I'm confident I'll never be over 8000 lbs or so on the axles. As was stated, most TTs don't have the same amount of capacity and the tires are sized to handle the axle load with only a small margin.
In most cases, when you weigh the trailer you will find you need to run at the max psi on the sidewall anyway to safely carry the load. Do NOT run below the max psi unless you have carefully weighed the trailer and done the math.
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JJBIRISH
Butler, PA, USA
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Joined: 10/06/2002
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BurbMan wrote:Here is the Goodyear inflation table:
And here is the Maxxis table for ST tires:
thanks for posting the tables while they are arranged different they are essentially the same for any ST tire, and there are different charts for other types of tires...
I am guessing that maybe 5% of the trailers out there have actually been scale weighed, and maybe another 10% use information supplied by the mfg... and the rest after set-up guess or could care less... and the then there are the ones that take the dealers word on it that everything will work out fine...
while the charts work, my weight changes up and down while on my 7 month journey... and I am close enough to the weight to use the maximum anyway and don't weigh often enough to rely on the chart... so I just always use use the maximum...
I have used the maximum on lighter trailers I have had also and never had a problem with tire wear or ride from them either...
I wish I had axles heavy enough to use the charts to smooth out the ride... I have about a 10% margin over the full GVRW and wish it were closer to 20%...
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