Our 2007 is one of the earlier ones and has the 6,000 lb. axles. We are very heavily loaded, at 14,620 lbs. We put the rig on a scale and we are under the combined axle rating by 240 pounds. That's not a lot but it is enough. What I don't know is that each axle is under its 6,000 lb rating. I've not found a scale where they will weigh each axle separately. Tire wear so far indicates we have no axle problem.
Despite the 6,000 lb axles ours has the higher-rated pinbox with a rating of 19,500 lbs.
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