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Old 10-06-2010, 02:07 PM   #1
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FR installed tires don't meet GVWR?

Never really paid much attention to the specs till I started reading some of these threads.

My 09 Rockwood Windjammer 3001W came with 14" rims with Carlisle Radial Trail Tires in a size 205/ 75-14. with are rated at 1760 lbs each.

1760 X 4 = 7040 lbs.

GVWR of trailer is 7632 lbs.


I don't even know if going to to a 15" rim and larger tires would be an option as the wheels are pretty close to each other already. I'd be interested to know if they changed the axle Centerline distance when they went to the 15" wheel combo on newer Windjammers.
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Old 10-06-2010, 02:24 PM   #2
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I have the same tires on mine, as well, and my GVWR is 7575 lbs. Had it three years, so far no tire problems- (knock on wood)! I've noticed that the 2010' and 11's have 15's as well. I also don't think that a 15 would fit in the small gap allowed by the axles. And, I've checked on load range D tires, and it seems they don't make em in 14"!!! So basically, seema we're SOL!! Randy
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Old 10-06-2010, 02:49 PM   #3
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Originally Posted by DCRC View Post
Never really paid much attention to the specs till I started reading some of these threads.

My 09 Rockwood Windjammer 3001W came with 14" rims with Carlisle Radial Trail Tires in a size 205/ 75-14. with are rated at 1760 lbs each.

1760 X 4 = 7040 lbs.

GVWR of trailer is 7632 lbs.


I don't even know if going to to a 15" rim and larger tires would be an option as the wheels are pretty close to each other already. I'd be interested to know if they changed the axle Centerline distance when they went to the 15" wheel combo on newer Windjammers.
looks like the gvwr includes weight carried by the tongue, thats pretty normal for RV's
dont know why
but cargo trailers usually rate by the axles
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Old 10-06-2010, 03:17 PM   #4
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looks like the gvwr includes weight carried by the tongue, thats pretty normal for RV's
dont know why
but cargo trailers usually rate by the axles
I have an 18 ft tandem axle flat deck that is rated the same way. Has 3500lb axles and is rated at 8k GVWR with 15" load range C Goodyear Marathons.
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Old 10-06-2010, 03:21 PM   #5
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Originally Posted by 08flagvlite View Post
I have the same tires on mine, as well, and my GVWR is 7575 lbs. Had it three years, so far no tire problems- (knock on wood)! I've noticed that the 2010' and 11's have 15's as well. I also don't think that a 15 would fit in the small gap allowed by the axles. And, I've checked on load range D tires, and it seems they don't make em in 14"!!! So basically, seema we're SOL!! Randy
Maxxis does make a 215/75-14 that gives us an extra 100 lbs per tire and only a slightly larger diameter.

Only towed a few times and no problems here either, thankfully.

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looks like the gvwr includes weight carried by the tongue, thats pretty normal for RV's
dont know why
but cargo trailers usually rate by the axles
That does make me feel a bit better. Guess I'll will try and weigh the trailer next time out and see what kind of safety margin I truly have.
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Old 10-06-2010, 03:27 PM   #6
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don't forget that your truck hitch carries some of that weight. my fifth wheel has an axle weight of 9664 with an unloaded vehicle weight of 11,594 and a gross weight of 15,500 on a set of 6,000 lb. axles, it would seem that my axle are not up to the task but 2,431 lbs is carried by the truck, of course now that I do the math, if I load my trailer to the max of 15,500- 2431= 13,069 lbs, I guess i am still over my axle weight. But than again I really don't know if I have 6,000 or 7,000 lb axles, well I thought I had it figured out. Guess I will have to look at my axles now.
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Old 10-06-2010, 05:33 PM   #7
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Originally Posted by 08flagvlite View Post
I have the same tires on mine, as well, and my GVWR is 7575 lbs. Had it three years, so far no tire problems- (knock on wood)! I've noticed that the 2010' and 11's have 15's as well. I also don't think that a 15 would fit in the small gap allowed by the axles. And, I've checked on load range D tires, and it seems they don't make em in 14"!!! So basically, seema we're SOL!! Randy
Randy: Kumho makes 14-inch load range D tires, and they can be purchased from Tire Rack. I put them on a previous camper to replace the Goodyear 14-inch C tires that were very close to being maxxed out on the old trailer. The Kumhos were great tires.
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Old 10-06-2010, 05:41 PM   #8
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all they need to do is equal to the axle rating. 3500 pound axle and tires rated for 7000+. Where is the problem?
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Old 10-06-2010, 08:51 PM   #9
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As another poster said, subtracting the TW puts the tires within the GVWR. My axles are exactly at the limit and tires 850 lbs more than axle. I'll take a little extra tire, fine with me.

GVWR = 8,633
TW = 880 according to FR (actual TW is higher)
AXLES = 7,752
TIRES = 8,600

8,633 - 880 = 7,753 I have a pound to spare!!
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Old 10-06-2010, 09:59 PM   #10
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Remember that the tongue weight (or pin weight) that they list is unloaded...it will be a lot more on the loaded camper at it's GVWR.

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