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Old 06-07-2013, 12:23 AM   #1
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Got the RV weighed - need tire pressures now

Well, today I was able to get my RV weighed at a local shipping company. The RV is a 1997 Thor Residency, 37', tag axle, 460, F53 chassis. The RV had a full fuel tank (75 gallons), full water tank (76 gallons), full propane tank (85 pounds) and some tools/cleaning supplies. Other than that, it was pretty empty, except for me (225 lbs). However, the total weight was 18,380 lbs. The front axle was 5,640 , the dually axle was 11,140 lbs and the tag axle was 1,600 lbs. I'm wondering if this was weighed correctly because the original build sheet says the total allowed weights are 6,000 front, 11,000 dually, 3,000 tag axle. It seems like maybe the weight was not totally on the tag axle, but the scale operator said that she knew how to weigh an RV.
Also, the paperwork said the RV should weigh 17,050 with a full fuel tank (no water or anything else). Do these weights sound right?
Also, the purpose of weighing it was that I wanted to find out the proper tire pressure, based on the axle weights, but I can't find anything for my tires (Maxxis Bravo Commercial LT - 235/85/16)
Does anyone have any suggestions for a chart or tire pressures?
Thanks again.
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Old 06-07-2013, 12:41 AM   #2
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Until you can find a tire chart use the pressure on the sidewall IF if the wheels will allow it. By doing that you shouldn't be under pressure. Use that till you can find the weight pressure chart for your tires.

Our original tires needed 125 psi for the weight, but the wheels would only take 120. Michelin wrote us a letter on their letterhead allowing the 125 psi rating while only inflating them to 120 psi. Ran them that way for 8 years.
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Old 06-07-2013, 12:47 AM   #3
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I did put the tires at 80psi, which is the max cold air pressure. However, that seems like to much in the tag axle since it's not carrying much weight. Still does not seem like it was weighed correctly.
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Old 06-07-2013, 10:16 AM   #4
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I looked at Maxxis web site but don't see your tire with the info you gave. You might give them a call. Just remember there is a minimum pressure for tires no matter what you weigh.
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Old 06-07-2013, 05:46 PM   #5
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Thank you for all of the comments/suggestions. In looking at the tag located on the RV, it states that max cold air pressure is 80psi. I checked a couple of charts and the actual tires themselves and the max load is listed at 3,250 lbs at 80 psi.

Based on the charts it looks like I would want about 75 lbs in the front, 80 lbs in the main axle and I don't know how much in the tag since each tire is only carrying 800 lbs. Based on the chart that would be about 35 lbs, but that does not make sense. Should I keep the tag axle at 70 lbs even though there is very little weight?

I would like to shift more weight to the tag axle, I'm not sure how to do that. I would need a little more research.
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Old 06-09-2013, 12:51 AM   #6
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The light weight on your tag could be caused by the rubber springs not being able to support the weight because of fatigue. I replaced mine late last year. Best $600.00 I spent, greatly improved the ride and handling. I installed them myself, not hard with the correct tools.

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Old 06-09-2013, 11:22 PM   #7
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How would I know if the tag axle rubber spring is tired? The RV has 35k miles on it and rides and handles great. Any ideas would be appreciated.

Thanks.
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Old 06-10-2013, 01:48 AM   #8
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Either use a very bright light or take a picture of them as I did. With the pictures I could see the starting of small cracks and tears in the rubber. Also the steel plates were not parallel with the weight of the coach on them. Mine only had a little over 50k on them.

Chuck
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