I would check with Newell Coach. Beginning with the Series 2000 in 1990, Newells have had a tow capacity (GCWR-GVWR) of 20,000 lbs but depending on the customer's desire, they had hitches that were typically rated less than that. As you have found, most 2" hitch receivers are Class IV and only rated for 10,000 lbs. I can tell you from personal experience that a Hensley Arrow hitch is a great hitch which is not only weight distributing but also virtually eliminates sway. There is a model available designed for up to 14,000 pounds. The downside is that it does add another 12-18" to the total length of your rig.
However, that is a mute point if the receiver on the coach isn't up to handling a 14,000 pound load. Typically a Class V receiver is required to tow over 10,000 pounds and, as you have noted, they are typically 2-1/2". Putnam makes a 2" receiver hitch (XDR) rated for 15,000 pounds. Again, I would check with Newell as to the feasibility of install such a hitch on your coach.
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