Use the equipment to take it to the street then. You are thinking too much man. If you hired someone, what would they do? Well, if they had a forestry mower attachment, they would use that. If they only had a skid steer, they would use that too. If they can't get the truck to the piles, then they move the piles to the truck. Sure you might mess up some grass, but you are going to be doing grass in the back anyways, what's a bit more seed? In life there are people who try to do things by hand, expecting the poor souls expecting to pick up a can of grass clippings and a few twigs to move "tons of brush" for them without charging more because this project will consume the rest of the weekends for the next year. Or there are other people who want to get done and go on to the next project, and go about it in the same manner as people who do it for a living would. Anyone you hire would show up with some machinery, and make it happen. Is running brush from the back yard to the front to load fun? No, but everyone here does it, most on a daily basis. I would drop the trees i was gonna take out first, then use the machinery to move it all.