I have a 2019 Rebel with a 4in level and 1.5 rear coil spring spacers that I recently fit a set of 37's on it just to see how they felt. Let's just say once you get over 35's you really start to feel a difference. I had the stock 18in wheels with a set of Kumho AT52's in a +size of 295-70-18 which is right at a 34in tire and it rides great, pretty much like stock. I then was gifted a set of 20in wheels and tried a set of 35-12.50-20 tires and the ride really firmed up but still felt lively and had a look that I was going for but I was 37in curious at this point because there was still room. I then bought a well used set of 37-12.50-20's to try on the Ram 20in wheels and they actually fit without rubbing after trimming just a little bit on the backside by the doors. I liked the look but holy crap did the ride quality, acceleration, shift points, and braking suffer compared to the 35's. I found it strange because even though the 37's are larger, they were lighter 10ply tires compared to a heavier set of 12ply 35's. Not sure what was up with that but I rode on them for a week and I took them off yeaterday to put my stock Rebel 18's back on and I was happy to have my nice ride back.
All that said, I am back to wanting a set of 18in TRX wheels and tires to try out next because I believe the combination of more sidewall, lighter load range D tire, and look of the 325-65-18's that come on the TRX will ride and look awesome. Just FYI, my truck is a 2019 Rebel 4x4, Hemi (non-ETorque), 3.92 gears, no lift kit. Pics below show the truck all three ways.
