Yes, kinda high sounding right
It's probably related to the A/T 33" tires and maybe the springs/shocks that are used on Rebels.
Generally tire manufacturers always recommend you to stick with factory psi recommendations for liability reasons. Also, your PSI warning is set from the factory and if you stray too far from it, you will get a constant dash warning to add air. For those that want to change their pressure by a lot, like say go from 55 to 35, they need to use a tuner to change that setting.
I do run my pressures at about 20-25 psi for off-roading though, but it's only temporary so I haven't invested in a tuner. However, when I level my truck in the future and go with aftermarket 34-35 tires, I may want to run lower pressures on the street, which will mean using a tuner.