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Old 06-03-2016, 06:43 PM   #1
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One wheel over after weigh-in

We just returned from a rally where I was able to get my rig weighed (2015 32' 5th wheel). The service performing this used scales to weigh each tire individually, the same type of high-end scales the Highway Patrol use.

According to the attached report the left front 5th wheel tire is overweight by 200lbs...Yikes!

It appears the truck is balanced pretty well, the front left-to-right, rear left-to-right and front to back. The pin weight looks good and it is under 900lbs GCWR, also it is 1500lbs under max rear axle limit.

When I looked at the trailer, it didn't look so good. The left-to-right and front-to-rear balance of the two axles is off. But I wonder how much variance is acceptable. What really concerns me is the left front trailer tire. The LRC tire rating is 2150 max so @ 2350 that means it is 200lbs over. I want to add the trailer is not over-loaded, it is under GVWR by 239lbs.

Before I got it weighed I thought it would be important to know because others have said to move stuff arount to balance the weight, however, the left side has the larger slide containing the refer and oven so I don't see that I can move anything to balance it out. There is no storage in the rear of this unit, nor on the sides over the wheels. There are two areas at the very front where the front jacks are and just behind that area a pass-thru.

I spoke with FR and basically got not traction there even though it's still on warranty. I'm planning on going up to LRD rated tires, so do I just go that or what?

Thoughts and advice welcome.

-Craig
Attached Files
File Type: pdf Trailer Weigh Report.pdf (260.7 KB, 69 views)
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Old 06-03-2016, 07:26 PM   #2
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Your real problem is running C-load China bomb tires. That brand has a reputation for failing. You can replace them right now or wait until they explode, possibly causing a lot more damage.

I'll defer to people with more fiver experience to answer the rest because with mine we just move the horses around for balance.
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Old 06-04-2016, 07:43 PM   #3
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What bothers me about the weights is that the front axles are toting ~600lbs more than the rear axles on both sides. If the RV is level to the surface, the load should be pretty equal between the front and rear axles. I realize that you have torsion axles so the distribution is never going to be equal, but it should be closer than 600lbs.

I think I'd call the axle mfg. and see what they say about it.
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Old 06-04-2016, 08:40 PM   #4
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I agree with you guys, so thanks for the suggestions. I'm getting new tires and calling the axle mfg next week.

I thought the 600lbs between the two was quite a lot too, I wonder if there's any rule about that. Perhaps someone with design / engineering knowledge will chime in. The one tire @ 2350 is also concerning.

Forrest River tech guy did not seem concerned with it and I got the impression they'd wait until there's collateral damage before acting on it, whereas, I'm just trying to prevent anything before it occurs.
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Old 06-04-2016, 08:43 PM   #5
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Craig
Good job for making the effort to learn the facts on weight distribution.
You are correct to be concerned about the tire load. Overloading a tire can lead to its failure if it is overloaded enough. While you do need to stay under the GVWR it is also important to stay under each axle GAWR and under each tire's max load capacity.

As a point of reference by federal regulation tires on your car are suppose to have no more than 94% of the max tire capacity when the vehicle is fully loaded.
You need to remember that when driving the road is not perfectly flat so load shifts. Also side loading from wind and cornering needs to be considered.

If as you have learned. FR built the RV with enough inherent unbalance that you cannot unload the heavy side of the RV then your only option is to increase tire load capacity.

This means you need more air pressure or more air volume as it is the air pressure and volume not the tire that carries the load.

When increasing the air pressure with a higher Load Range you need to be sure the wheel is rated for the higher pressure so may need new wheels too.

Good luck.
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Old 06-05-2016, 09:19 AM   #6
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Get some decent load range E light truck tires if you can fit them and be done with tire worries. Most ST trailer tires are made in China and are ticking time bombs even if you upgrade your load rating.

Good luck and kudos to you for weighing your camper.
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Old 06-05-2016, 09:38 AM   #7
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I have to disagree with all the "China Bomb" comments thrown around this forum. Pretty much all ST tires are now made in China or somewhere else in Asia and they aren't all crap.

To the OP, definitely upgrade your tires to a reputable LRD tire. I just put Maxxis M8008s LRD on my TT but the Duro LRC tires it came from the factory with performed flawlessly for the 6 years of service they provided. I also had metal valve stems installed for the higher pressure in the LRD tires. Thanks to wmtire for his assistance with that.
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Old 06-05-2016, 09:47 AM   #8
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Maxxis aren't immune from tire blowouts either. I was seriously going to buy a set for my camper and a quick google search dissuade me. I will say that Maxxis tend to have a better reputation than China ST tires.

I'm glad you had a good experience with your Maxxis.
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Old 06-05-2016, 09:59 AM   #9
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Quote:
Originally Posted by TonyD View Post
Maxxis aren't immune from tire blowouts either. I was seriously going to buy a set for my camper and a quick google search dissuade me. I will say that Maxxis tend to have a better reputation than China ST tires.

I'm glad you had a good experience with your Maxxis.
Tony, I had a good experience with the LRC Duros. I just put the Maxxis tires on last month and haven't been very far with them. Time will tell.

As long as the user is diligent about weights and tire pressure a reputable tire should provide a better chance of avoiding a tire failure. Nothing is guaranteed. On my old '99 Coleman popup, the original Carlyle tires were 13 years old when I sold it. They were definitely overdue for replacement but there were always stored indoors out of the sun.
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Old 06-05-2016, 12:39 PM   #10
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Obviously (see my sig.) I'm biased toward LRD tires on this brand of trailer and agree there's probably not too much you can do about the side-to-side difference. I likely have even more of a side-to-side difference... kitchen AND wardrobe slide on off-door side and only a short slide with two recliners on the door side.

But from the difference on the axles, I sounds to me like the trailer is nose-low. If the truck is squatting excessively you may need to look at those vintage-2003 rear springs (you shouldn't need airbags on a 2500 with that trailer). If the problem isn't squat, you maybe need to raise your fifth wheel a bolt-hole or two (2003 trucks were generally shorter than newer models).
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