I used 4 heavy duty padded hooks from Home Depot. They are called "Heavy Duty Arm Hangers". In my Home Depot they were near the tool boxes and shop vacs.
I did not use the hardware that came with the hooks, instead I used some 1/4 x 2" Lag bolts. I bolted the 2x12 to the studs (in three places) with 3/8 x 3" Lag bolts with fender washers