There have been posts about this here in this forum and unless something has significantly changed, the manufacturer (don't ask the dealer) doesn't recommend this because of the stresses it puts on the pin area. The thing you could be sacrificing is the front cap integrity.
Again, check with Keystone for your model of rig. Consider that they'll probably tell you that you can't do that. While the dealers should know this, they should also know to tell if the rig is too heavy for your TV and they don't. Keystone will probably also tell you you can't double tow with their rigs even though others have done this with success (and some shored up hardware).
I recollect the High Country is a new helium lightweight technology and don't know if this improves things so you can use a gooseneck adapter.
The B&W companion is a great hitch but pricey and the best one for you TV's setup.
Good luck with what you find out.
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