Brand new 5th wheel-- blowout from the factory to the dealer

Too many assumptions made here about the cause of a tire failure. I am not defending the "Chinese" tire, but there are all kinds of road hazards out there in addition to faulty valves stems and rims. I have those "China" tires on with two failures, both due to road debris. DW hit a turtle once and the shell cut the tire.

I once bought a brand new American Made tractor and the engine blew with only 12 hours on it. It seems one of the pistons wasn't tighten properly.