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Old 06-15-2016, 07:15 PM   #1
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1978 31' Sovereign
Grimes , Iowa
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New Tires - What PSI?

Hello All:
We are finally going to use our new to us 1978 AS Sovereign 31' Land Yacht. It is mostly original with the exception of the refrigerator. We are planning on gutting it and updating to our likes, but for now it is going into service. The kids want to go to Mount Rushmore at the end of the month. I began inspecting it for our journey and noticed cracks in all four tires. I replaced them with E rated trailer tires. My question is do I run them at 80 psi or at 65 psi?

Thanks for any help. I am anticipating many opportunities to learn on this trip.

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Old 06-15-2016, 07:17 PM   #2
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What do the tire sidewalls say?
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Old 06-15-2016, 07:39 PM   #3
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Start at 80 if it rides to rough try 65
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Old 06-16-2016, 07:49 AM   #4
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The side wall reads:
E load rating and 80 psi max
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Old 06-16-2016, 07:52 AM   #5
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I would run 65, you are nowhere near the max load capacity of 4 E rated tires. No point in beating your coach to death especially if it has the original axles.
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Old 06-16-2016, 08:47 AM   #6
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When in doubt use the max.
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Old 06-16-2016, 09:29 AM   #7
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What we have here is a situation where the vehicle had one size tire on it when it was produced, and the tires have been replaced with another size from a different sizing system. It would be nice if we knew more about the original tires and what the vehicle tire placard says.

But if that info is not available, it is likely that 65 psi a good guess - and I would suggest followup monitoring: Check the pressure buildup during an extended high speed run - and hour or more. If the pressure build up is less than 10%, that would be good. If it is more than 10%, you need more pressure and if it is more than 15%, you need to take immediate action - like slowing down and adding air right now!
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Old 06-16-2016, 04:46 PM   #8
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I ran 65 on my 86 32 . I run 70 on my 90 32 start at 65 if the trailer tends to say it's tail and sway and it is hooked up correctly with anti sway hitch go up about 5 lbs .that stopped the little bit of sway that was left in mine.
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Old 06-17-2016, 10:58 AM   #9
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Dry weight ranges from 4700 to 4800 pounds

Depending on how you travel with tank levels, loaded weight could be 1000 to 2000 pounds more.

Actual weight would be best measured on a scale so at least you have a reference and can add or subtract as you travel or restore.

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Old 06-17-2016, 12:57 PM   #10
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1977 31' Sovereign
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Side wall PSI says one thing. Owner's manual says another. Which is correct??

The owner's manual for my '77 Sovereign says 45 PSI.

Stick with the owner's manual.

Tom
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Old 06-17-2016, 01:07 PM   #11
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Side wall would be max pressure for max load on a cold tire.

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Old 06-17-2016, 01:22 PM   #12
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I start at 65 cold and let them warm to 70.
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Old 06-17-2016, 01:35 PM   #13
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The pressure is irrevalent

What is relevant is that you put pressure monitors on the metal valve stems. You don't want an unrecognized blowout: then put 65 # in them.
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Old 06-17-2016, 03:03 PM   #14
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I have 65 psi cold per the placard on the side of the trailer.
When I am underway the pressure increases to 70-72 psi due to heat while rolling.
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