tdawg918
Newbie RV’er
2021 KZ Durango D333RLT, 2022 Ram 3500 Limited 4X4, B & W Companion Hitch
Posts: 10
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Post by tdawg918 on Dec 20, 2022 16:42:49 GMT -5
Hi All,
Just replaced tires on our 2021 333RLT. Went with Sailun S637 ST235/80R16 LRG 14Ply. These list 110# at 4080 lbs Max Load per tire. When I weighed the unit on our las trip it weighed 10,000 lbs. Unless you are supposed to add the Pin weight for the total weight. That was 2700lbs. In the Sailun chart I have 2500 # (each tire) minimum pressure is only 50 PSI. I realize that's the minimum, but it still seems kind of low. Any help on what I should run? Also purchased Lippert tire link. What should the minimum and maximum pressure and temperature be set at. Any info would be greatly appreciated.
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Post by Soleman on Dec 20, 2022 19:28:38 GMT -5
Welcome!
I owned a set of those tires on my previous trailer, I wish I would have been able to remove them and put them on my current trailer!
Anyway I ended up calling Sailun and talked to an engineer back in 2016 who basically quoted the weight chart but said it was personal choice how much over recommended PSI I could run them.
Just keep in mind if you run too high PSI they will tend to chatter or bounce on poor road conditions etc.... My old pull behind trailer loaded for travel was just over 10,000 Lbs. I ran them at approximately 85 PSI without issue.
Rule of thumb for this size tire is approximately 150 lbs of weight per tire for every 5 psi inflated.
Example:
10,000 lb trailer weight divided over 4 tires = 2,500 lbs per tire, 2,500 divided by 150 lbs of weight = 16.6, (x) times 5 PSI = 83.3 PSI inflated cold.
Hope this helps?
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Post by 660catman on Dec 21, 2022 7:56:33 GMT -5
Welcome! I owned a set of those tires on my previous trailer, I wish I would have been able to remove them and put them on my current trailer! Anyway I ended up calling Sailun and talked to an engineer back in 2016 who basically quoted the weight chart but said it was personal choice how much over recommended PSI I could run them. Just keep in mind if you run too high PSI they will tend to chatter or bounce on poor road conditions etc.... My old pull behind trailer loaded for travel was just over 10,000 Lbs. I ran them at approximately 85 PSI without issue. Rule of thumb for this size tire is approximately 150 lbs of weight per tire for every 5 psi inflated. Example: 10,000 lb trailer weight divided over 4 tires = 2,500 lbs per tire, 2,500 divided by 150 lbs of weight = 16.6, (x) times 5 PSI = 83.3 PSI inflated cold. Hope this helps? I just used this method to figure out mine. It’s bang on the 70 psi I have them at. Trailer came with 80 psi in them and the dishes found new places in the cupboard. |
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tdawg918
Newbie RV’er
2021 KZ Durango D333RLT, 2022 Ram 3500 Limited 4X4, B & W Companion Hitch
Posts: 10
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Post by tdawg918 on Dec 21, 2022 8:33:17 GMT -5
So for the weight, do you include the pin weight or just the trailer?
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Post by Soleman on Dec 21, 2022 9:08:35 GMT -5
I really don't know the official answer.
My guess would be to calculate for the actual weight on the tires.
I'm also very aware that the loads our RV tires see while traveling are extreme compared to the static load we are calculating for. I would error on the high side and back off a little if it feels too bouncy or rattles everything inside the RV too much?
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Post by nvguy on Dec 23, 2022 0:12:22 GMT -5
I would say the actual weight on the tires, pin weight is on the tow vehicle.
Interesting the difference between the Sailun pressure recommendation (50 PSI) and the "rule of thumb" (83.3 PSI).
One thing to bear in mind is where and how fast you tow. Towing at 70 MPH in 110 degree ambient is a lot harder on tires than 60 MPH at 75 degree ambient.
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