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Old 10-23-2013, 07:59 AM   #1
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6000 pound axels on columbus 325

Have a question for you guys on a 2013 columbus 325 rl with a GVWR 13970 why would they put 6000 pound axels on it seems to that there setting up the products to fail

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Old 10-23-2013, 09:34 AM   #2
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You're forgetting about the weight that is on the pin...1970 lbs. Most manufacturers calculate GVWR by adding axle capacity to the dry pin weight, which is this case is 12000 + 1970 = 13790. Using their specs with a dry weight of 10654 lbs (which is fictitious), there will only be 8684 lbs on the axles. It's got lots of axle carrying capacity.



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Old 10-23-2013, 09:38 AM   #3
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Thanks for the answer Dave
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Old 10-23-2013, 09:39 AM   #4
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Looking at the specs:

The idea is that the pin weight carries a portion of the weight. So while there is a 13,000 pound GVWR, less than 12,000 pounds would be carried on the axles.

Here's the math that I figure for this (assuming a loaded to the hilt camper).

Pin weight percentage:
dry hitch weight / dry weight = 1,970 / 10, 654 = 18.5%

Pin weight at max:
gvwr * pin weight percentage = 13,970 * .185 = 2,584 pounds
(Note, even this is possibly low since your pin weight sometimes increases as you add stuff to the front storage hatch.).

Weight at axles:
gvwr - pin weight = 13,970 - 2,584 = 11,386 pounds

It doesn't seem like it would ever be over 12,000 pounds at the axles.
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Old 10-23-2013, 10:19 AM   #5
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Columbus is like most manufactures within the FR family and Thor, make many of their selections on cost. Arguably this keeps the cost of the coach down, unless you are forced to pay for expensive repairs, replacement tires, etc...7000 or 8000 pound axles are obviously more expensive. The manufactures protect themselves from allegations of negligence by keeping it barely within the individual capacities, but often times, just barely. In the overall scheme of things this is probably not a bad margin, I have seen much worse margins on tires.
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