Naturally, short truss have less bow than the longer ones. Deflection in long trusses can weaken the gussets. Using the Truss Stiffener can help decrease the bow in them while being lifted into place. Attach the Stiffener over the top of the bottom chord with screws, lay a 2×4 in the channel and secure with screws to keep it in place. When you have the truss upright, you can remove the supports, or leave them on and remove once the truss is set.