I'm gonna hang a 100 pounder in the garage. It's about a 25 foot span with 24" on center 2x4 trusses--drywalled in. My plan is lag bolt a 54" 2x8 to the ceiling across 3 beams & attach the bag in the center. Should I go up in the attic & screw some 8' 2x4's to the 3 2x4's that will be supporting the weight(spead the load out more)? Any suggestions appreciated.