Low tech answer: Generally speaking the final product weight limits are
established by the weakest component rating installed from the supplier.
Tire ratings
axle ratings
transmission ratings
spring ratings
The motorhome industry plays some silly games with these ratings, but I
think most everyone else is pretty conservative.
Joe A
> I've always wondered how these weight limits are determined - by the
> engineering or marketing department? I generally use a substantial
> safety factor. With my enclosed trailer I'm towing about 5,000 lbs, so
> I look for a tow rating of 7,000 to 8,000.
> Larry
>
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