I have a 1000 cropmaster ballast , weight 44 pounds- I have a 2x 6 ceiling joist which I have put a 4X6 bridge block between joist- I have a solid mounting surface- If I put in lag bolts how do I suspend with bungie cords as has been suggested in stickies. A lot of weight and I do want to rubber mount for vibration if I can!!Do not want this thing to come crashing down from 8 foot high