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Open Roads Forum  >  Truck Campers

 > Cooper Tires - problems - Now what do we do.

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Buzzcut1

Norcal

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Posted: 07/07/12 09:14pm Link  |  Print  |  Notify Moderator

Toyo open country HT's w tuff duty 285/75R16 load range E are rated at 3750 pounds and have held up really well for me


03 F350 Diesel 4x4 Crew Cab long bed, 08 Lance 1055, Rancho XL9000, Air Lift air Bags, Torqlift tiedowns,stable loads, super hitch, 48" super truss, Toyo M143 245/70R19.5 tires, Vision 19.5 wheels, front and rear Roadmaster Anti Sway Bars


jimh425

Western WA

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Posted: 07/07/12 09:47pm Link  |  Print  |  Notify Moderator

I think Cooper should warranty them no matter how many times they fail. Talk to Les Schwab. With rare exceptions they are great to deal with.

But, if you are in Oregon, you should be able to get Gs pretty fast from Les Schwab with Visions. Are you running 80 lbs of tire pressure running in the rears?

Is there anything you can move to the front seat?


'10 Ford F-450, 6.4, 4.30, 4x4, 14,500 GVWR. '06 Host Rainer 950 Dbl Slide, Torklift Talon tiedowns, Glow Steps, and Fastguns. Firestone Air Bags, Hankook DH-01 225/19.5 Fs, Curt front hitch, Energy Suspension bump stops.


louiskathy

Oregon (presently)

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Posted: 07/08/12 12:01am Link  |  Print  |  Notify Moderator

jimh425 wrote:

I think Cooper should warranty them no matter how many times they fail. Talk to Les Schwab. With rare exceptions they are great to deal with.

But, if you are in Oregon, you should be able to get Gs pretty fast from Les Schwab with Visions. Are you running 80 lbs of tire pressure running in the rears?

Is there anything you can move to the front seat?


Back seat is full... front seats are for us.
Yes, we've had 80 psi all the way on this trip.

I will be going to the scales and weighing before I dump the holding tanks in a couple of days. I want to know what we're dealing with, too.

We used Les Schwab for all our tires up until this Cooper Tire purchase in March. We wanted Coopers and they didn't carry them.

We'll see what Cooper does when we take the tire to them on Tuesday. I'll let you know what they say when they get the tire shipped to the evaluation place. I think we had the check within two weeks on that first tire that got the big bulge in it back in Globe, AZ.


Kathy

rhagfo

Portland, OR

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Posted: 07/08/12 12:11am Link  |  Print  |  Notify Moderator

up2nogood wrote:

rhagfo wrote:

I would not think a 9.5" camper would be too much load on the rear axle, but have you weighed the truck with the camper loaded?

The max load on a "E" rated tire is 3,417# or so, that would be 6,834 which is a lot of weight.


Max load on my E rated tires is 3640 total 7280 assuming the op's are the same, here is pretty close to what they have , the truck around 3300 on the rear wheels , mine ( Ford Superduty 350 CC SB ) is just over 3300 with a fifth wheel hitch, and a full tank. From what I can find their camper is around 3400 dry weight. That puts around 6700 on the rear axle of their truck without even a gallon of milk in the fridge. Leaves around 500-600 lbs of cargo, propane ,water ,clothes etc. Not much to get to the max weight of those tires assuming they are rated for 3640 same as mine, some E rated are rated lower, some a bit higher . Pretty iffy on an E rated tire regardless of brand, and IMO Michelin is not a secret formula, granted they might be the better tire, but according to consumer guide for whatever it is worth the Cooper AT3 was rated #1 the Michelin AT2 was rated #2. Still IMO they would be better served going 19.5 with the miles they are traveling.


Interesting, I was going from memory, 3,415 is what it is 265/75 16's Toyos.
What size and brand are yours?


Russ & Paula
The Beagles Hedwig and Precious.
Portland, OR.
2001 Dodge 2500 4X4, 5.9 Cummins 5 speed, 3.55 gears, Pacbrake PRXB, DS Power Puck,Bilstien 5100's, 275,000 miles.
2005 Copper Canyon 293 FWSLS

"Visit and Enjoy Oregon State Parks"


Lowsuv

Oregon

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Posted: 07/08/12 12:21am Link  |  Print  |  Notify Moderator

Host Campers are the best. But they are heavy.
The scales are your friend.
You could be much heavier than you think.
Michelin Tires are the best.
And you pay for that.
I have them on my Duramax, Porsche, and Benz.
I see a set of 3715 # load capacity 285/75 R 16 E tires in your future.
In Oregon , I weigh my rigs and trailers at the Oregon scales alongside the highway for free. You can weigh each axle separate. After hours.

SoCalDesertRider

Arizona desert

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Posted: 07/08/12 08:38am Link  |  Print  |  Notify Moderator

louiskathy wrote:

rhagfo wrote:

I would not think a 9.5" camper would be too much load on the rear axle, but have you weighed the truck with the camper loaded?

The max load on a "E" rated tire is 3,417# or so, that would be 6,834 which is a lot of weight.


Right. The rear tires should carry around 6,500 lbs just fine.

Reading the label on the frame of the F-350
The front GAWR is 4250
The rear GAWR is 6210

The GYWR is 9900 lbs

The Host Camper is just under 3,000 (I suppose that's dry weight)
Fresh Water holds 60 gals (We never carry more than 1/2 that with us.)
Gray holds about 45 gals (We dump before we roll the wheels.)
Black holds 35 gals (We dump that when we roll the wheels.)
Figure 8 lbs/gal... 100 gals = 800 lbs of water
4 passengers = 1,000 lbs (there just the 2 of us tho)

This truck has the smaller engine. The 5.4
and holds about 40 gals of gas... so figure 400 lbs of fuel

I can't possibly be overload but we're going to the scales soon just for my own peace of mind.

Am I missing something in my calculations?? I should be fine with an E rated tire.
If your camper's dry weight is 3000 lbs and your truck's RGAWR is only 6200 lbs, you could very well be overloading the rear axle/tires. I bet if you weigh the truck, it's over 6200 lbs on the rear axle.

What size tires are on the truck and what is their load weight rating (stated in lbs, on the tire side wall)?


05E350 6.0PSD
97F350DRW 7.3PSD 4x4 4.10 11' flatbed
98Ranger
69Bronco ATC250R CR500
20' BigTex flatbed carhauler
Callen Camper

92F350 CrewCab 4x4 351/C6
B&W TurnoverBall, Curt Magnum V
HD Springs Bilsteins,
285/75-16E BFG AT on 16x8 Stocktons
4.56's & LockRite rear

SoCalDesertRider

Arizona desert

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Posted: 07/08/12 08:56am Link  |  Print  |  Notify Moderator

Ok, I read your profile and your truck is a '99 F350SRW. This means it should have come factory stock with 265/75-16E tires, rated 3415 lbs each and the RGAWR should be 6830 on the door sticker, which is 2 times the rear tire load rating.

I'm not sure where you got the 6210 number for RGAWR. That is about right for an '05-up F250, but is wrong for a '99-'04 F350SRW. Should say 6830 RGAWR and 9900 GVWR and 265/75-16E at 80 psi as the factory tire size rating and rear tire air pressure spec, on the VIN/info sticker on the driver's door of your '99 F350SRW pickup.

If your loaded rear axle scale weight is greater than 6800 lbs, you should swap tires and wheels to a larger, higher rated size.

I swapped the rear wheels and tires on my F350SRW to 285/75-16E BFG AT tires, with 3750 lb rating each x 2 = 7500 total. I also swapped the wheels for heavy duty Stockton steel 16x8's with 4000 lb rating each x 2 = 8000 lbs. I also swapped my rear springs for heavy duty 7-leaf packs, rated 4300 lbs per pack x 2 = 8600 lbs, plus the factory overload springs, which are about 700 lbs, I think.

I've been carrying 4000 lbs in the bed of the truck with this tire/wheel/spring combination for about 5 years now. No problems from the tires, wheels or springs. The brakes don't like it at all and the axle itself is overloaded (6250 lbs max axle weight rating) but the wheels, tires and springs are all happy.

I recently upgraded to a dually F350, with 8250 lb rated rear axle and bigger brakes, to carry the weight the SRW truck has been carrying. The dually does a much better job of carrying the weight, as well as stopping it, than the SRW F350.

Once I'm done building a new flat bed for the dually, the welding rig will go permanently on the dually and the SRW F350 can go back to being my play truck and carry lighter loads that are a better fit for it's braking ability.

Mike and Terry Ann

Hooversville,Pa

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Posted: 07/08/12 01:54pm Link  |  Print  |  Notify Moderator

If the same wheel ..maybe a bad wheel not tire.

jadatis

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Posted: 07/08/12 02:38pm Link  |  Print  |  Notify Moderator

You can go over the 80 psi for the E-load tires.
This is not the maximum pressure but the reference-pressure.
This is what is also given as advice on the michelin agillis camper tires.
This is in fact an D rated tire with reference-pressure of 69 psi but is adviced on Dutch campers with their high weight on the rear, at 80 psi.
The maximum cold pressure for standing still ( so less highening up when warm) is 1.4 times the referencepressure put on the sidewall like this "maximum load xxxx lbs AT YYY psi ( cold)" . So if you use 1,2 times the Pr for peakloads you
still have reserve for warming up. For lower speeds the tire-makers have lists for higher maximum load with higher pressure, so this extra load is even supported by the tire-makers.

17oaks

17 Oaks Ranch

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Posted: 07/08/12 04:31pm Link  |  Print  |  Notify Moderator

Alpha tire descriptors/ratings have mostly gone by the wayside. Everyone is using the International load rating systems now:



Tire load ratings


US DOT Specs:

Load Range/Ply Rating

A

2

B

4

C

6

D

8

E

10

F

12

G

14

H

16

J

18

K

20

L

22

M

24

N

26



Speed Rating

Max Speed/MPH

M

81

N

87

P

93

Q

100

R

106

S

112

T

118

H

130

V

149

W

168*

Y

186*


Don
17 Oaks Ranch, Texas
US Army (RET)
'11 F350 4x4, CC, LWB, DRW, Lariat
AF 1150, solar, satellite
Vietnam Combat Veteran


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