The door jam sticker shows tire pressure at max axle loading.
I run 55-60 loaded in rear. If yours is a daily driver I'd try 45-50 empty rear. Always 65-70 front.
A suggestion, Most DRW trucks are a PITA to adjust or check the rear tires. I went to my local truck shop and bought short valve stem extenders. It is easier if you remove the outer wheel, install the extension and then re-install the outer wheel so the stem is opposite the inner.
http://www.ryderfleetproducts.com/ha...alve-p-hal-ds1
Jim
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2012 Ram Laramie 3500 DRW 4x4 3.73 Tow Max Pkg B&W Companion 60 gal RDS aux fuel tank. 2014 Montana 3150RL, 2 A/C's, Leather, 6 Point Jacks, Splendede WD2100XC, Mor/ryde X-Factor, Duravis 250 tires with TST 507RV monitors. 2 x Honda EU2000's