Well it all depends on what your doin! With the long arm, you will get more articulation. Your cruisin a dually so i'm gonna bet that wheelin is not in the plans! There are some really great suspension lifts out there with reg. or 1/2 inch over stock lenght control arms! I run a 4.5 fabtech lift and I really love it! Plus it won't the height of your bed but and inch or two!