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Old 02-18-2019, 05:38 AM   #1
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Load range E tires too much?

I had a set of load range C Power king Towmax tires on my 5th wheel. Rode great but tires all separated. Cheap china bombs I know that now but they rode great.



In my infinite wisdom I though the heaver the tire the better. I went to my local tire guy. He suggested Carlisle radial trail HD. I opted to jump over the load range D and go straight to E. 2800 lb capacity, 80 psi, 80 mph speed rating. Whole trailer only weighs 10,000 lbs.



Well now the trailer rides like a dump truck. Everything is all bounced everywhere. Wife is not happy.
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Old 02-18-2019, 05:57 AM   #2
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As an alternative why not install Shock Absorber's. You'll probably have to fabricate up some brackets but the shocks will improve the ride characteristics of the 5th wheel immensely. The old tires were thin and thus absorbed a lot of the road vibrations. The new tires with the load range "E" are much thicker and do a better job of providing mental security but lack in the comfort area. Mental security in the form of not having to worry 'too much' about tire separation or blow outs.
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Old 02-18-2019, 05:57 AM   #3
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We had the Carlisle Radial Trail HD "E" on our previous fifth wheel, but it weighed 14,000 pounds. We loved the ride they gave on that particular trailer. You might try a bit less air in each tire just to see if it improves the ride any.

Remember - the tire pressure recommended on the side of the tire is the MAX pressure for the MAX load - so I wouldn't think it would hurt to deflate slightly for a considerably lighter trailer.
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Old 02-18-2019, 06:22 AM   #4
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Weigh your trailer as loaded for camping then adjust the tire pressure to your load. You may find the ride improves.
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Old 02-19-2019, 05:30 AM   #5
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Weigh your trailer as loaded for camping then adjust the tire pressure to your load. You may find the ride improves.

I weighed it a couple years ago. If I remember right I'm around 7500 on the trailer axles.
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Old 02-19-2019, 05:33 AM   #6
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Quote:
Originally Posted by LJowdy View Post
As an alternative why not install Shock Absorber's. You'll probably have to fabricate up some brackets but the shocks will improve the ride characteristics of the 5th wheel immensely. The old tires were thin and thus absorbed a lot of the road vibrations. The new tires with the load range "E" are much thicker and do a better job of providing mental security but lack in the comfort area. Mental security in the form of not having to worry 'too much' about tire separation or blow outs.

I talked to the dealer I bought the trailer through. He said the same thing. That shouldn't be too hard to do.
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Old 02-19-2019, 07:51 AM   #7
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I weighed it a couple years ago. If I remember right I'm around 7500 on the trailer axles.
Things can change.
I weighed my MH 5 years after the first weigh in, and it was over 1,100# heavier. I thought I was fully loaded for the first weigh in.
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Old 02-19-2019, 07:24 PM   #8
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Good point.
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Old 02-20-2019, 01:42 PM   #9
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I was about to put E's on my 5'er till suddenly I didn't own it any more. I figured that was a good reason not to. I might put them on my little TT when it's time, we'll see.
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Old 02-20-2019, 02:01 PM   #10
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Load range C on a fifth wheel seems kind of light since they have a max weight rating of like 1400 lbs (could be why they separated to begin with), on 10k weight 5th trailer assume 2k pin weight so that leaves 8k on the axles/4k per axle/ 2k per tire. The load range E tires do not have to be aired up to 80psi. Me I would weigh the rig find out how much is on the trailer axles then look up the load inflation table of the tire and put in the correct pressure for that weight, add another 5 or 10 psi for an additional safety factor. You might only be looking at 60psi which will give a noticeably better ride than 80psi. Load range C tires have a max inflation of I think it is 50psi. Still do the shocks which would help the ride even more.
IIRC my load range E tires I have only at 65psi for my trailer weight and that still gives me a substantial safety margin for the weight they are carrying.
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Old 02-20-2019, 02:21 PM   #11
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I am amazed that there were C's on the trailer, obviously they were not strong enough for that heavy trailer.
I have D's on my 7800 lb. trailer now and I'm switching to E's this spring.
MUCH better to be over rated than under.
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