LOL....if me...I'd just stick with the higher class currently own and avoid the risk of dropping down in TV class by ordering the wrong one that would cost tens of thousands more than the sunk cost that the one sitting out on the driveway right now...
That 'might' be enough TV...and since lower class and towing at or over the limits/ratings/etc...to be worn out faster...
And NOT be as capable to 'manhandle' the issue when Mr Murphy crosses my path some day...as the 'sizing'...'ratings'...'specifications' are NOT for the good days out there...but for that day Mr Murphy crosses your path and you need every part of that specification the OEMs dialed in for 'that' vehicle...
But that is just my opinions on this matter....