Older body lifts used to have problems with spacers and bolts failing. That is no longer and issue with the modern materials. The only real "con" I can think of is that any aftermarket frame mounted accessories will nto work, or look funny or need to be modified.
Bumpers, grill gaurds, winch trays, tow hooks, recievers, nerf bars, will all be away from the body or not work at all.
Also, the body is higher, but the frame is still low and can be dragged.
As for "pros", the added body clearance, center of gravity is not raised as much as a suspension lift of the same height, more tire clearance, cheaper, can't really notice on the Rams unlike the Fords and Chevys, easy install compared to a suspension lift.