3 x 7k axle but only 20k GTW???
Looking at upgrading TT toyhauler for 5th wheel toy hauler (grand design momentum) specific floor plan still being debated. Anyhow, why... if it has three axles rated @ 7k each (not to mention pin wei...
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BurbMan wrote:
It's the tires. A load range E tire has a rating of 3042 lbs @ 80 psi, so the axle is limited to 6084 lbs even though the axle itself is rated at 7k.
So 3 axles is a total of 18,252 plus whatever on the hitch/pin plus a safety margin for loading...side-to-side and front-to-rear, depending on how the rig is loaded will not distribute the load equally over all 6 tires, so if running at max weight it's likely that at least one tire overloaded and one is underloaded.
If I recall correctly, the Grand Design Momentums are coming with LR G tires.
Even so, my LR E tires that I originally had were good for 3,420 which brings you to 20,520 plus pin weight.
For the OP - I wondered the exact same thing. I think this would be a good question to send to Grand Design. My guess is it has to do with either the pin box (could be a 20k pin box) or the frame.
I wanted a GD but couldn't get by with the 3,500 lbs. of cargo carrying capacity in a 43' toy hauler. It didn't make sense to me.
