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Old 07-22-2010, 10:20 PM   #1
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How do you rate your trailer load to tire max load? rig?

UPDATED NUMBERS and CALCULATIONS

I'm trying to see if my C rated tires are able to handle my 5th wheel as well as the load. Tell me if my way of calculating is right or wrong.

My trailer dry weights 7,463 lbs
My max load is 1,674 lbs
My 5th wheel hitch weight is 1,108 lbs
My trailers 4 tires are rated Load Range C with max at 2,150 lbs at 50 psi

If I add my trailer weight plus max load weight minus my hitch weight I come up with 8,029 lbs divided by 4 tires equals 2,007 lbs on each tire.

And the tires at 50psi of 2,150lb has some extra lbs of about 142 lbs each.
So what I plan is buying a better quality load range C tires.


Meaning my wife can add an additional 571 lbs to the trailer before the tires overheat and blow.
Thanks!
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Old 07-22-2010, 10:33 PM   #2
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That's correct...that would be the maximum load on the tires with the trailer at it's GVWR. The pin weight will be higher than 1108 lbs if the camper is loaded to it's GVWR. You must have some bad keys on your calculator though. 7463 + 1674 - 1108 = 8029 or 2007 lbs per tire.

I'm not sure where you got the tire load info. I'm sure that the tires on your 8285WS is the same as our 8280WS which comes with 225/75R15 'C' rated at max 2150 lbs.

Dave
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Old 07-22-2010, 11:22 PM   #3
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Originally Posted by Dave_Monica View Post
That's correct...that would be the maximum load on the tires with the trailer at it's GVWR. The pin weight will be higher than 1108 lbs if the camper is loaded to it's GVWR. You must have some bad keys on your calculator though. 7463 + 1674 - 1108 = 8029 or 2007 lbs per tire.

I'm not sure where you got the tire load info. I'm sure that the tires on your 8285WS is the same as our 8280WS which comes with 225/75R15 'C' rated at max 2150 lbs.

Dave

Thanks Dave for correcting my numbers. I pickup my 8285WS tomorrow and will get more details. I'm just trying to figure if I should look around for a D rated tire if I was close to max these. I do think they are 225/75/15 but I have the aluminum rims which is another issue because I think they will only hold a max of 60psi and if I go to a D Range time 8 ply or more I think I may need a steel rim thatcan handle the higher psi.
The aluminum rims are rated 15X6JJ and have a max psi rating of 60 psi.
This issue may be a Catch 22 and if I decide to change I may need to also upgrade to steel rims.
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Old 07-22-2010, 11:50 PM   #4
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Save your money for more trips to Camping World!

Going to D rated tires is a bit of a waste as the camper has only 4000 lb axles which would be the weight limiting factor. It's unfortunate that Forest River doesn't offer a axle upgrade option on their 5er's and the standard axles are so close to the limit.

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Old 07-23-2010, 12:29 AM   #5
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Originally Posted by Dave_Monica View Post
Save your money for more trips to Camping World!

Going to D rated tires is a bit of a waste as the camper has only 4000 lb axles which would be the weight limiting factor. It's unfortunate that Forest River doesn't offer a axle upgrade option on their 5er's and the standard axles are so close to the limit.
Dave
This is why it is a Ultra Lite trailer.
No extra weight at all.
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Old 07-23-2010, 08:41 AM   #6
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Quote:
Originally Posted by Dave_Monica View Post
Save your money for more trips to Camping World!

Going to D rated tires is a bit of a waste as the camper has only 4000 lb axles which would be the weight limiting factor. It's unfortunate that Forest River doesn't offer a axle upgrade option on their 5er's and the standard axles are so close to the limit.

Dave
I am aware of the 4000 pound axles, BUT:

1: The Carlisle Load range C OEM tires are THE WORST tires in the industry. (Their D range tires are MUCH better but still score well below every one else's C rated ones.) More blowouts and accelerated tread wear with these Chinese tires Load range Crap tires when you check the forums.

2: Load range D tires have 2 more belts (plys) and some even have a Kevlar ply for limited impact protection.

3: Load range D tires have stiffer sidewalls so even if you run them at the correct cold PSI for your actual weight (50 PSI; not their max rated 65 PSI) they run cooler and last longer.

4: After my Carlisle Class C tire exploded on the DC beltway at rush hour (like all day), I now have 4 new Goodyear Marathon D rated tires on my camper (Made in the good old USA). Remember to replace the stems with the high pressure type for stiffness especially if you use the pressure transmitter caps.

Blow Out - Carlisle Range C pictures from travel photos on webshots

Blow Out - Carlisle Range C pictures from travel photos on webshots

Oh and did I mention that they were made a YEAR before FR installed them on my camper? Their 3 year warranty already was 1/3 used when I picked up the camper and I had the camper a year before the blowout. Thus, while still "under warranty" the credit was not going to be much.
The dealer DID say the ancillary damage to the fender would be covered "if my claim was approved" but the fender trim was just 40 bucks so I just bought the trim piece and repaired the damage myself.

When Goodyear looked at the OTHER tires as they came off, they marked the tires to show where dry rot cracks and bubbles were already weakening the sidewalls and around the rim bead.

Not only THAT, but the dealer just dumped me to contacting the tire manufacturer directly! I do not know if that is industry standard BS or not, but it was without a doubt THE LAST STRAW with that dealer.
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Old 07-23-2010, 08:45 AM   #7
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Not all Goodyear Marathons are made in the "good ole USA". Check the side wall of your tires and you may find "made in good ole CHINA"
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Old 07-23-2010, 09:00 AM   #8
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Quote:
Originally Posted by Iggy View Post
Thanks Dave for correcting my numbers. I pickup my 8285WS tomorrow and will get more details. I'm just trying to figure if I should look around for a D rated tire if I was close to max these. I do think they are 225/75/15 but I have the aluminum rims which is another issue because I think they will only hold a max of 60psi and if I go to a D Range time 8 ply or more I think I may need a steel rim that can handle the higher psi.
The aluminum rims are rated 5X6JJ and have a max psi rating of 60 psi.
This issue may be a Catch 22 and if I decide to change I may need to also upgrade to steel rims.

Went over this as well with Goodyear.

50 PSI is within the safe inflation pressure for D range tires. You do not have to inflate to the MAX RATED pressure unless you need the MAX RATED LOAD for the tire.

With Load Range C tires you MUST inflate to the MAX RATED PSI since with even minimum junk we run pretty close to the max rated camper weight.

With Load range D you have a huge safety buffer (weight wise) and 60 PSI would be well within the safe inflation zone.
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Old 07-23-2010, 09:01 AM   #9
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Quote:
Originally Posted by windrider View Post
Not all Goodyear Marathons are made in the "good ole USA". Check the side wall of your tires and you may find "made in good ole CHINA"

Stamped "Made in USA" on sidewall.

There are some Marathons "made in Canada" but not the ones on the camper.

None are made in China according to the dealer.

Goodyear does have a cheaper trailer tire (not Marathon series) made in China so be careful.
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Old 07-23-2010, 10:00 AM   #10
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Ok Lou. So you have Goodyear Marathons on your rig at 60 psi. Correct?
Do you have the aluminum rims or the stardard metal rims?
I have been told that the 15X6JJ rims (aluminum) are rated for 60 psi which is fine. If my local American Tire dealer has Goodyear Marathons I plan on seeing if they will put the D rated (8 ply) on them.
See the attached picture of my rims
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