^^^^^ BOTH the 350/450 are labeled as 14,000. The REALITY is the 450 can carry more weight. It's the 14K that limits all DRW trucks. BUT that is just on paper and has NOTHING to do with what the truck can actually weigh. That is all dictated by the manufacturers to keep their DRW trucks in "Class 3". Any heavier and licensing and insurance become an issue in MANY areas.
Example my unloaded FAW is around 5,200# my RAWR is SAE rated at 9,750#. WOW how can that be, 14,950#. I run OVER 15K on my truck every time I tow. I am licensed to carry that load. I am at or below my SAE axle ratings and below my combined weigh. My typical towing weight is 33K and when I tow two Cruiser bikes behind my RV I am at 35K.