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Old 10-23-2018, 06:44 PM   #1
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12 or 14 ply, What Do You Use On Your Motorhome Tires

The reason I am asking cause I just bought my 2nd time around on 14 ply 245/70-19.5 tires on my 20,500/25,500 lb chassis motorhome, the factory had the Goodyear 12 ply but I have upgraded to 14 ply, the thicker the ply the harder the drive but the safety factor goes up, with my trailer/Jeep combo I am 14,300 on the rear axle and with the factory 12 ply I am at max weight or near on tires but with 14 ply I have extra safety for weight and still run 5 psi less.


So why does the RV makers or at least in 2008 on mine did they use 12 ply when it was almost at max, was it for a softer ride during test drive for sales or just to save money, when you replace your tires did you up the ply or stay at factory specs.

Just some food for thought, I guess the 22.5 folks don't have to worry much about this.

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Old 10-23-2018, 07:40 PM   #2
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Not sure if you've noticed but about 90% of the manufactures don't give anymore than the minimum. Most new RV's sell on features and price. Many people won't pay more because the tires are better but will pay more for an extra TV or extra bathroom. Most auto makers do the same.
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Old 10-23-2018, 08:58 PM   #3
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Ford or Workhorse chassis?
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Old 10-23-2018, 09:31 PM   #4
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Ford or Workhorse chassis?
Ford F-53, 2007 chassis on a 08 Bounder
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Old 10-23-2018, 09:40 PM   #5
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This isn't gonna help you much, but I have '18ply" on my bounder 38n. They are load range J, Hankook AH-37's. The ride is smoother than my old Michies! Coming in at 34,000 lbs loaded, I feel much more confident!
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Old 10-23-2018, 09:54 PM   #6
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This isn't gonna help you much, but I have '18ply" on my bounder 38n. They are load range J, Hankook AH-37's. The ride is smoother than my old Michies! Coming in at 34,000 lbs loaded, I feel much more confident!
Is that the ply the factory had or did you also have to upgrade the ply.
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Old 10-23-2018, 11:37 PM   #7
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Part of my understanding of the ply 12 vs 14 or F vs G rating is the sidewall is stronger and has less flex with higher loads and can handle higher PSI, I could stay with the 12/F ply but with my trailer weight in back the F rated tires will have more flex and run hotter but might run softer, I also hear a lot of blow outs on RV's so I thought the 14/G rated tires would offer a safer ride but a little stiffer at the same PSI.

Motorhomes don't do so well in blow outs..
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Old 10-24-2018, 12:16 AM   #8
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My 99 F53 came with G 14 ply, upgraded to H 16 ply, rides and handles much better.
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Old 10-24-2018, 04:39 AM   #9
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If the original tire meets the specs, why go with a higher spec tire.

Unless you plan on grossly overloading them, they will be fine.

Tires go flat from leaks. Leaks, and running at low pressures, cause failure ( blow out ). Higher ply rating won't fix that.
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Old 10-24-2018, 06:16 AM   #10
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I bought two 245/70R19.5 Roadmasters (14 ply "G" rating) a year and a half ago right after I bought the Southwind.

I'm not sure if they helped or hurt the ride, It seems like its about the same. Its stiff, about the same as my ole Mirada..


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I have them on the front, and put 7500 miles on them. I don't notice any wear. In a couple years I'll buy two more and rotate the tires..
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Old 10-24-2018, 04:09 PM   #11
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If the original tire meets the specs, why go with a higher spec tire.

Unless you plan on grossly overloading them, they will be fine.

Tires go flat from leaks. Leaks, and running at low pressures, cause failure ( blow out ). Higher ply rating won't fix that.
The tires Ford installed way back when, Goodyear 245/70R x 19.5F, had ample capacity to support 13,500 lbs axle when inflated to the recommended 80 PSI (13,660 lbs). Load the axle to 14,300 lbs and you are pushing the numbers on the axle but the tires still has plenty of capacity when inflated 90 PSI (14,620 lbs).
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Old 10-24-2018, 07:56 PM   #12
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The tires Ford installed way back when, Goodyear 245/70R x 19.5F, had ample capacity to support 13,500 lbs axle when inflated to the recommended 80 PSI (13,660 lbs). Load the axle to 14,300 lbs and you are pushing the numbers on the axle but the tires still has plenty of capacity when inflated 90 PSI (14,620 lbs).

That's why I went to 14 ply cause the 12 ply would be running near max load on the rear, with 14 ply at 90-95 psi I have about 2000 lbs extra safety rate as to Firestone PSI/Load rating on there chart, also the 14 ply will have less flex on sidewalls and should run cooler, I also have not weighed my setup since I did some adjusting to how I load the RV and moved the Jeep 2 1/2 inches back on the trailer, I hope I am under 14,000 lbs now, yes I am over my 13,500 lb axle rate but not by a lot, Fleetwood from the start made my motorhome heavy on the back to begin with and did not leave a lot of extra carrying weight in the back but the front runs lite..

Its far better for safety to me and anyone else on the road to have extra carrying capacity on the tires than to be at or near max when I am loaded/towing 26,500 lbs going at 65 mph.

Blow outs also happen cause tires are at max weight and get hot, its not always from under inflated or age.
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Old 10-25-2018, 08:23 AM   #13
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Almost every trailer or even RV I have bought have always came with load rated tires just enough to meet the load limit of said vehicle/or trailer. My thinking is this, and for reference it's only my opinion, OEM would rather the consumer have a tire failure rather than an axle/suspension failure if the vehicle/trailer is loaded past it's capacity. I always try to run one range higher if possible on any tire I have used for my personal truck, RV, and trailer. I have never had an axle or suspension failure as a result of over loading.


Currently we have J range tires on the RV (22.5) and they are Goodyear's. No problems as of yet in 12K miles. We load this thing to the max when we travel. We always travel with full tank of water in case of emergency. I have no idea what the total weight is but I bet it's close to max.
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