Thank you all for the advice and guidance. Based on what was said here I decides to not deal with the dealership about the tires and sell them later. I test drove the 2019 RAM yesterday and it was amazing. Today I have appt to test the 2018 Chevy High Country 6.2l with its 22" tires. It sucks that it's payload is 1333 on the door sticker but I can probably gain 50 lbs when I sell those 22" tires. My current trailer is under 5000 lbs loaded up.
My jeep Grand Cherokee 3.6 liter can tow but it really needs to hover around 4000 rpm for max torque. It drops down to 50 mph often each time I start even a moderate climb if I try to save gas and keep if at 3200 rpm. Which gives me the best gas mileage. The difference between 4000 rpm + when trying to stay over 60 mph at all times vs being mindful and making sure on the return trip to go over 3200 rpm on the return trip home is a full tank of gas. That's one less gas station fill up and $65 less money. Each way is about 750 miles I think.
I would be very curious to see what my gas bill would be making that trip again in a 2018 Chevy 6.2l doing 65 mph to 70 mph on average. Bit it just occurred to me that the Chevy and or the RAM truck night require Premium gas?