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Old 03-14-2016, 09:53 AM   #31
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his is from a NHTSA PDF Q&A document. It should be mandatory reading for those doing the PDI on their new trailer or MH before they sign on the dotted line.

"The FMVSS have requirements for the manufacturer to use proper tires and rims for the gross axle weight rating (GAWR) and the gross vehicle weight rating (GVWR). The manufacturer may determine the GVWR by adding cargo capacity (if any) to the curb weight of the vehicle as manufactured. The wise consumer, before purchase, will determine if the vehicle has sufficient cargo capacity to carry the weight of water, additional equipment (such as televisions, and microwave ovens), and luggage. The manufacturer’s certification label must show the GVWR. The GVWR must not be exceeded by overloading the vehicle. There is little the government can do to assist a consumer who has purchased a vehicle that has insufficient cargo capacity for its intended use."


On edit; Tires are fitted to GAWR on trailers and GVWR on MHs.
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Old 03-14-2016, 09:55 AM   #32
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Yes!... x10....

Get a grasp on this concept: if you buy a 10# sack and put 10# in it, it COULD break; after some use, and abuse the odds of that increase. It is insane to complain that the sack is under-engineered. Absolutely, insane. Repeat after me: INSANE.



The human tendency for the most part, is to want something for nothing; and particularly in America; the lowest price is the driver; quality be damned. The demand for cheap goods has driven manufacturing off shore and is hurting all of us.



The RV industry isn't being deceptive or dishonest, the numbers are right there on the rigs; in BRIGHT yellow! I think people go gaga at the fake granite and fake wood; most wouldn't know quality if it smacked them in the face, and if they find it they would shy away after seeing the price. But, they totally ignore the important things. It isn't the industry and its isn't the poor engineer that we should be beating on. We have met enemy and he is us.



WW

I couldn't agree more!


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Old 03-14-2016, 01:41 PM   #33
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I've got two 3500 lb axles under my toy hauler. With my sidexside stuffed in full of water and everything else my wife packs inside I have seen 7200 pounds on the scale. I was worried until I did some major research on my axles and some bigger. When I found out the only difference between an alco 3500 lb and 4000 pound axle was the outer bearing I stopped worrying. A slightly bigger bearing was all. So ever time I stop I checked my bearing temps. They are literally cool to the touch after driving for 100 miles at 65 mph. I'm not saying what I do is ok but I personally am fine with it.
Per the Lippert manual the 3500 and 4400LB both take the same inner and outer bearings. Since I have the 4400 it make me wonder about my weight.
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Old 03-14-2016, 02:27 PM   #34
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Per the Lippert manual the 3500 and 4400LB both take the same inner and outer bearings. Since I have the 4400 it make me wonder about my weight.
Mine as well. I have 4k axles but the bearings are the same as the 3500. This is because the 4k rated axles just use a beefier axle tube, but the same 3500 hubs.
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Old 03-14-2016, 02:39 PM   #35
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Mine as well. I have 4k axles but the bearings are the same as the 3500. This is because the 4k rated axles just use a beefier axle tube, but the same 3500 hubs.

Actually from what I found with al-co axles axle tubes for the 3500 and 4000 were the same 2 3/8 inch. Just the outer bearing made the difference. Now the 4400 pound jumped up to a 3 inch tube and had the same bearings as the 4000. But if wanted and 3500 pound axle could be ordered with a 3 inch tube. Figure that out. Even leaf springs were the same on all three axles. Was all changed with bearings. Only was their a big change once jumped to a 5200 pound axle where brakes and spindle sizes came into play.
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Old 03-14-2016, 05:19 PM   #36
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Actually from what I found with al-co axles axle tubes for the 3500 and 4000 were the same 2 3/8 inch. Just the outer bearing made the difference. Now the 4400 pound jumped up to a 3 inch tube and had the same bearings as the 4000. But if wanted and 3500 pound axle could be ordered with a 3 inch tube. Figure that out. Even leaf springs were the same on all three axles. Was all changed with bearings. Only was their a big change once jumped to a 5200 pound axle where brakes and spindle sizes came into play.

Interesting. When I called Lippert they said the bearing set was the same for their 3500 and 4400 axles. I sure hope so since I have a set as spares. Earlier I mistakenly said my axles are 4000. Click image for larger version

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Old 03-14-2016, 05:25 PM   #37
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Brand New Trailer - Axles Too Light for GVWR

So the difference with your axle is probably the axle tube size.

Another thing that was interesting to me was I had a good friend that had bought a stealth toy hauler. I have a sandstorm they are pretty much exactly the same. But he had 5200 pound axles under his. I was looking closely at the leaf springs and I swear they were identical. Length size width all of it. Was quite surprised.
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Old 03-14-2016, 05:29 PM   #38
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Actually from what I found with al-co axles axle tubes for the 3500 and 4000 were the same 2 3/8 inch. Just the outer bearing made the difference. Now the 4400 pound jumped up to a 3 inch tube and had the same bearings as the 4000. But if wanted and 3500 pound axle could be ordered with a 3 inch tube. Figure that out. Even leaf springs were the same on all three axles. Was all changed with bearings. Only was their a big change once jumped to a 5200 pound axle where brakes and spindle sizes came into play.
Yea just doesn't seem to make since. What will the axles in these ranges really support????? Dumb design, but then after 30+ years of owning RVs I'm getting use to "bare minimum". I agree, weights are posted and it's our charge to "Read and Heed". However, for those of us that have axles in this range, what should we actually believe. 2 x 3500= 7,000 or 2 x 4400= 8800?
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Old 03-14-2016, 05:31 PM   #39
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So the difference with your axle is probably the axle tube size.

Another thing that was interesting to me was I had a good friend that had bought a stealth toy hauler. I have a sandstorm they are pretty much exactly the same. But he had 5200 pound axles under his. I was looking closely at the leaf springs and I swear they were identical. Length size width all of it. Was quite surprised.

This is straight from an engineer at Lippert:

"In the evaluation of up-rating the 3500# axle to 4400# we discovcered we needed to only change the axle tube and leaf spring to a heavier version. The remaining components; spindle, brake, hub, bearing set etc have more than sufficient strength and performance to handle the 4400# axle loads and meet our minimum safety margins. The brakes meet CSA D313 braking standards along with the hubs. The bearing set we have calculated the expected life assuming proper maintenancce is done and it exceeds 50,000 miles. The published bearing ratings still exceed the rated axle capacity."
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Old 03-14-2016, 06:45 PM   #40
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That is some interesting info. Which leads me to believe my "3500" pound axle is gonna be fine. Because a newer bigger more expensive camper is not in the budget right now. And we really like our toy hauler it suits our needs great.
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