I have exactly what you need to hook your Coleman Fold N Go BBQ Grill up to your 2019 Coachmen Crossfit Motorhome. For this, you will want to use the MB Sturgis Sturgi-Flow T-Fitting w/ Hose for POL Valve part # 103608. We also have a quick-disconnect option with the MB Sturgis Sturgi-Stay T-Fitting for POL Valve part # 103537-MBS and the MB Sturgis Quick Disconnect Propane Hose part # 100476-72-MBS.
I would be willing to bet the adapter hose you have now has a Type I fitting on the tank... view full answer...
The closest fitting option would be the Greystone 32" Electric Fireplace with Crystals # 324-000076 which has a flange width of 33-7/8 inches. This would be just a little over the length you'd mentioned but not by much as it would be 3/8 of an inch. view full answer...