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Old 06-16-2015, 01:49 PM   #21
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It sounds about right. Did you weigh the coach with you and your wife in the rig? What is the steer Axel weight rated at? If it's 10400 as I suspect you are very close to max weight. I also add 5psi as a fudge factor because without a four point weight you don't know if one side is carrying more weight. Also with the extra 5 psi you don't need to add pressure if you have guests on a trip.
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Old 06-16-2015, 01:58 PM   #22
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http://www.forestriverinc.com/produc...168&Image=5027
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Old 06-16-2015, 03:32 PM   #23
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It sounds about right. Did you weigh the coach with you and your wife in the rig? What is the steer Axel weight rated at? If it's 10400 as I suspect you are very close to max weight. I also add 5psi as a fudge factor because without a four point weight you don't know if one side is carrying more weight. Also with the extra 5 psi you don't need to add pressure if you have guests on a trip.
Phil, you mentioned steer axle weight rating, are you just referring to the front axle weight rating, or is this something different?
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Old 06-16-2015, 03:41 PM   #24
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Berkshire 38A newbie question

Yes it's the front Axle can't find a spec on your front axle .
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Old 06-16-2015, 03:54 PM   #25
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Yes it's the front Axle can't find a spec on your front axle .
Front axle is 10,500
Rear axle is 17,500
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Old 06-16-2015, 04:02 PM   #26
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That's the way mine came but was upgraded to 12000 lb front axle. Is the weight with passengers?
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Old 06-16-2015, 04:10 PM   #27
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That's the way mine came but was upgraded to 12000 lb front axle. Is the weight with passengers?
Yes, but probably added couple hundred pounds since weighing
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Old 06-16-2015, 08:02 PM   #28
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We have weighed and front axle weight is 10,300 rear is 17,420. Divided 10,300 by 2 for the front and came up with 106 psi based on Goodyear chart for that tires with rear 17,420 divided by 4 and came up with 92 psi from chart. Does this sound about right? Thanks!!
Looks like you got it. Good job.
Many of us add about 5 lbs for side to side variance as Phil stated.

But, I wonder where you found your Goodyear chart.
The only ones I have found rounded to 5 lbs like this one.

http://www.goodyearrvtires.com/pdfs/rv_inflation.pdf
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Old 06-17-2015, 03:45 PM   #29
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I'm leary of only doing a front and rear axle weight and setting pressure based on those numbers. The heavy side on the axle sets the tire inflation pressure for the axle. Based on a four corner weight my side to side variation is right at 500 to 600 lbs. I haven't looked at the tire inflation charts to see how much difference that makes but hopefully the 5 psi many are suggesting is sufficient to account for the variation. If not then there's a chance you'll be under-inflated on one or more tires.
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Old 06-17-2015, 05:40 PM   #30
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Just make sure that all tires on the same axles are inflated to the same pressure.
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