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Old 08-26-2023, 03:48 PM   #1
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tire pressure

Had to replace tires on road last trip. Less than 1k miles on the castle rock 10 ply tires, two blow outs. They were set at 80lbs which is what is on travel trailer sticker. put on 2 -12 ply tires and 2- 14 ply tires. The tire dealer put 80lbs in all 4 tires. Tires say 95 on 12 ply tires and 115lbs on 14 ply tires that was install by tire shop. Should I leave at 80lbs.
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Old 08-27-2023, 03:00 PM   #2
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A Multi axle trailer should have the same load range tires on all axles.
All PSI should be the same.
All the tires should have the same type tread pattern.


Doing all the above ensures equal braking performance especially under hard braking events and especially on wet pavement....especially on a trailer that sees lots of hiway miles of service.

Most load E tires on rv trailers come with wheels able to meet 80 psi applications at a max.
Over pressuring a wheel can split the bead seat flanges and even crack the wheels valleys.

In your case I would shoot for 80 psi and watch the tires temps and wear patterns.
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Old 08-27-2023, 05:23 PM   #3
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You need to go by the trailers weight for PSI. I went from 80 psi E rated tires to 110 psi G rated 14 ply tires on my current TT. My tire dealer said 60 psi would carry the same load as the E's at 80 psi.
IMO they need to be aired up to equal the E tires rated load capacity at 80 psi which in your case would be two different psi's.
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Old 08-27-2023, 06:56 PM   #4
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Why would you put mismatching tires on your RV?
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Old 08-28-2023, 07:29 AM   #5
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Front and rear on a single rear wheel drivable maybe?
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Old 08-29-2023, 08:27 AM   #6
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Did not know that two was 14ply and two was 12ply when they were installed. Only tire place that I could find with 4 tires my size that was close. Both are rated for 3200lbs.
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