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Old 04-15-2014, 01:45 PM   #1
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Axle safety margin

Is there a axle safety margin. The reason I ask is with my toy hauler I will be now putting a sidexside inside and with water and food and clothes I will be right at my axles capacity of 7000lbs. Two 3500 pound axles. Not that I'm gonna over load my camper but this number has to be a low ball for safety sake I would assume. I would figure a 5-10% safety margin has to be in there some where although axle mfgs will not tell us that. What does everyone think of this?
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Old 04-15-2014, 01:48 PM   #2
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Another take on the problem is that you're possibly going to be loading one axle heavier than the other.

No idea about the safety margin, though.
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Old 04-15-2014, 02:00 PM   #3
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Most THs have a max load in the garage or toy area. Ours is 2500 lbs in the garage & 4500 lbs overall. Ours for example is about 9800 lbs empty 14400 gross.

Keep in mind some of your weight will be on the hitch or pin & not all on the axles......... Weigh it at a CAT Scale or other. I would not put too much faith in a safety factor.

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Old 04-15-2014, 02:14 PM   #4
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I went and weighed this weekend that is why I am asking this. With it connected to my truck I was at capacity. Was not what I was expecting but it is what is. I think it sucks but not much I can do about it.
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Old 04-15-2014, 03:17 PM   #5
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I think the only person who "may" be able to answer a loaded question about safety margins will be a factory rep...With that said (as with truck overload topics)...up to you on how you want to play on the factory stickers max weight listings, etc...
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Old 04-15-2014, 03:44 PM   #6
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Quote:
Originally Posted by Oaklevel View Post
I would not put too much faith in a safety factor.

No, but I WOULD put faith in a legal team that's going to low ball the rating for legal purposes. Not that I'd exceed it by very much, but I'm willing to bet it's not going to fall apart if you bust it by a few pounds.

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I think the only person who "may" be able to answer a loaded question about safety margins will be a factory rep.
I'm also willing to bet you'll never here anyone "officially" tell you anything but what's on the sticker.
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Old 04-15-2014, 04:02 PM   #7
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Just did some research on alko axles on their web site. Looking at the difference between the 3500 and 4000 pounds is pretty much nothing. Leaf springs, bearings, spindles. Even seen a part in the brochure for a 3500lb axle where it can be ordered with a bigger tube which would make it like the 4000 pound axle but would still be considered a 3500lb axle and with six lug drums. But the 4000 pound axle can be ordered with a 5 lug pattern if wanted. Spindles are exactly the same size and bearings are the same except for one outer on the 4000 is different but has the same inside spindle diameter. I don't get it. Their was so many different part numbers for all the components of each 3500 and 4000 that when looking at the sizes of each almost makes them identical.
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Old 04-15-2014, 04:22 PM   #8
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You can rest assured what is published is vastly different from what the design parameters are/were and what the actual test results revealed and you will never see either of them even in a court of law.
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Old 04-15-2014, 07:04 PM   #9
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You can rest assured what is published is vastly different from what the design parameters are/were and what the actual test results revealed and you will never see either of them even in a court of law.

So what are you saying? Always love your responses when it comes to weight issues. Not joking either you always make sense with your responses.
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Old 04-15-2014, 07:11 PM   #10
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So what are you saying? Always love your responses when it comes to weight issues. Not joking either you always make sense with your responses.
Having been a member of SAE (while I was a design engr for IH) and talking to other engineers, it was always a topic of discussion about what we designed and tested vs what was published. Don't know for a fact, but I would surmise the same in other industries, especially the automotive industries, Lippert, etc. You cannot design that close to a published figure that if the limit is say 3,000 lbs that it will fail at say 3,500 lbs.
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