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Old 04-11-2016, 01:56 PM   #11
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Candace123....We also have a 3029W and I upgraded to D's also. I would take the rig to a tire shop,,,,,it'd be a lot less headache.....and yes,,,,DEFINITELY get them spin balanced. I once had a salesman tell me that it wasn't necessary. Bull! A tire is a tire is a tire. An unbalanced tire cost me $5153 when it disintegrated in Ft Worth. Spend the money and don't let anybody tell you that you don't need balancing. Also I highly recommend a tire pressure/temperature monitoring system. If I had one at the time, I'd probably still have the $5153 in my bank account.
If you get the TPS system make sure you get metal stems on the tires. Don't get the rubber ones that flex.
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Old 04-11-2016, 02:11 PM   #12
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I'm sorry,,,,I forgot to mention the metal stems. Yup,,,,pretty important with the change from 50 to 80 PSI.
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Old 04-11-2016, 04:54 PM   #13
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So when we install 80 psi, load range D tires on our lighter weight tt, replacing the 50 psi load range c tires, which the factory deemed appropriate for that specific lighter tt the road shock transferred onto the tt and it's contents will be greater.

Is this a concern?
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Old 04-11-2016, 05:12 PM   #14
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Not sure. I asked the same thing quite awhile ago on a different forum and no one knew for sure. Lots of thoughts but no real conclusions. One that seemed like it was possible was there would be more suspension movement (hence more suspension wear) but not actually transferred to the trailer frame any more than regular pressure tires. Please remember this is just another members information not confirmed manufacturer facts.
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Old 04-11-2016, 05:33 PM   #15
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So when we install 80 psi, load range D tires on our lighter weight tt, replacing the 50 psi load range c tires, which the factory deemed appropriate for that specific lighter tt the road shock transferred onto the tt and it's contents will be greater.

Is this a concern?
LRD tires only require 65 PSI for maximum load capacity.
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Old 04-11-2016, 06:42 PM   #16
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I also changed my Load rated C tires on my Windjammer to Load D tires. The C's were 50 PSI and the D's are rated at 65 PSI. I figured I should air them up to the rated pressure, but the trailer rides very rough inside now; cabinets are shaken and contents are turned over because of the stiffer ride. I have been doing some research on this issue and found the Goodyear site to have some good information. Goodyear RV Tires – Performance, Durability and Comfort Click "Tire inflation and Loading" bottom left, then click "Download Load Inflation Table". My trailer weighs in about 7800# when we are ready to camp so that means less than 2,000# per wheel. At this weight I see in Goodyear's chart for the ST225/75R15 that I can run with 55# of air in our tires and handle up to 2270# of weight. I am going to try it on this weekend's trip and monitor the pressures and temps to see if it rides better.

This is as good of place as any to look for answers about running less than maximum pressure on higher load rated tires. It also suggests you call Goodyear to ask any other questions.
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Old 04-11-2016, 07:38 PM   #17
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DB,,,,,just watch them closely, because as you know.....an underinflated tire can ruin your day.
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Old 04-11-2016, 07:49 PM   #18
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Yes, I run a TST 507 religiously.
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Old 04-11-2016, 07:49 PM   #19
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I also changed my Load rated C tires on my Windjammer to Load D tires. The C's were 50 PSI and the D's are rated at 65 PSI. I figured I should air them up to the rated pressure, but the trailer rides very rough inside now; cabinets are shaken and contents are turned over because of the stiffer ride. I have been doing some research on this issue and found the Goodyear site to have some good information. Goodyear RV Tires €“ Performance, Durability and Comfort Click "Tire inflation and Loading" bottom left, then click "Download Load Inflation Table". My trailer weighs in about 7800# when we are ready to camp so that means less than 2,000# per wheel. At this weight I see in Goodyear's chart for the ST225/75R15 that I can run with 55# of air in our tires and handle up to 2270# of weight. I am going to try it on this weekend's trip and monitor the pressures and temps to see if it rides better.

This is as good of place as any to look for answers about running less than maximum pressure on higher load rated tires. It also suggests you call Goodyear to ask any other questions.
Alright finally a confirmed answer to harder ride beyond what I had before so my previous post has been answered. It appears that the key is to adjust tire pressure to actual trailer weight. This means to add scaling to checklist before departing so correct tire pressure can be set.

Now I need to find the correct inflation charts for the tires I have and the ones I want to buy (Maxxis 8008 or Carlisle both LDE, 10 ply tires). I'm pretty sure and really assuming there are specific charts for each tire. I hope this isn't opening a can of worms.
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Old 04-11-2016, 08:01 PM   #20
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IF, it has torsion axles, you MUST jack between the axles.
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