My 2014 Challenger has a hitch rated at 5,000 max. Newer Thors have same looking hitch but they are rated/stamped for 8,000. During factory tour they couldn't really explain difference. Since then I have heard Thor's hitch supplier simply stopped making 5,000 pound hitches and began sending them all 8,000 pound ones.
The V-10 and most of the trannies in these Class A's and C's could probably always handle 8,000. Now just a difference in what your tongue weight would be.
Full Time in 2017 Newmar Ventana 4369
pulling a 24' enclosed (Mini Cooper/Harley/Kayak)
(traded 2014 Thor Challenger)
US Army 70-73 Retired LEO