Just be aware that you'll have a TPMS warning at around 65 psi as that is below the low pressure stock programmed threshold.
There are ways to alter that threshold using an Autel tool that can access two modules in the truck. Dodge techs used to be able to access both modules with their OEM diagnostic tool but Ram decided, when the tool was updated to access newer models, to lock out access to those options.
There's a LOT more info and discussion in this thread:
http://www.ramforum.com/f158/hd_tire_pressure_monitoring_system_reset-70913/
As far as recommended pressures in the stock tires, you can air down to 60 psi cold but be prepared for some abnormal wear at the outside of the tread.
Many Ram owners have moved to a tire that requires less pressure but still has a Load Range E rating required for the loads an HD can carry.