I have a job where we are going to be adding a second floor to a garage. The plan is to lift the existing truss roof off, and set to the side, and then put back on after the second story is added. There are 16, W-type trusses 24" OC, the bottom cords are 24'. We plan on putting 2 strong backs 12' apart, that are 6' to either side of the ridge, to use for the lift. We will lift at two points on each of the strong backs, so there will be 4 points that carry the load. (~3,200lbs, truss & sheathing, shingles have been stripped). My question is, is it best to set the strong backs on the bottom cord at the intermediate gussets, or the top cord near the where the intermediate member meets. Thanks for you thoughts.