Waste of time to build all that when you can just back the truck up to the edge and throw them on. You are already are picking them up . Or you could have had the unit that put the pallet form the truck on the ground, put thing lift right on the roof.
I get em delivered from the building supply on a truck with a mini forklift and lifted to the roofline. Also delivered by conveyer belt. Pay for delivery but you be banging by now. Pow Pow Pow Pow
Roofer 15 years in. There's a easyer way. I prefer to only handel most bundles once. Your handling them 3 or 4 times by the time thay are layed. Only 7 bundles off each pallet need to be touched twice. A boom truck is worth the money. Better to have the guys work on the roof than move materials around.