Forklift is another easy way if you have the floor in place.
I used this method, cushion tired forklift, but a couple of issues to think thru with any lifter that can't go off the concrete...
...it has to go high enough to engage the peak, I didn't have enough travel on my mast and had to remove the forks and replace with a "post" with a couple of hooks which was a weldment I created here.
...at some point the forklift has to turn around to set the last few feet of trusses due to the counterweight end being too close to a wall. Eventually the "lifter" has to be withdrawn thru the 22-1/2" slot that's left, which rules out most standard forks.
...there also becomes an issue as the truss field is built and the daylight is being closed out, if the trusses are inside the walls, they have to be raised on a diagonal so the tails can clear the top plates of the walls (assume stud here). Eventually there won't be enough room for the diagonal. This requires putting more trusses up as a group in the center and building from the endwalls back, and finishing somewhere near the center.
I helped my neighbor who had access to a rough terrain forklift/shooting boom/telehandler. With 12' walls it required some thinking thru the geometry and using a chain so the arm could clear over the wall from outside after lowering. This was a much wider and taller building and the reach of the forklift arm was maxed out.
