You asked, so don't shoot the messager.....If you stay under a 12K loaded 5th wheel you will keep that truck with the towing specs. Anything more, you will exceed the specs on total truck, rear axle and maybe tires.
The eng and tranny are not an issue since they were also in the 350 DRW
If you want a 15K loaded 5th wheel a dually is in order.
Bill
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