Always use a boom truck when one is available to you.
The cost is nothing compared to the cost of a mans back,knees,life, workable roofing life.
Shingle nailer, i understand that you already use a boom truck and that is not your question.
your question is how to actually stock the roof in their exact spots.
I'd tell you but then i'd have to kill ya.
I try to be ready when the boom truck gets there and i pallet stack them at the peak.
Most steep roofs, you cant reach the peak with a boom.
thats when you should be experianced enough to ask for the crane. We have about 8 to 10 local roofing suppliers, all with a fleet of boom trucks and a crane.
If they dont own a crane, they know someone close by to rent one from.