My suggestion would be some long 2 X 12's. You'll have to figure out how long on each end. But I'm picturing a lead in 8' to the top of a 4" or 6" block and another off the back end. Attach a piece of angle iron to the bottom of the 2 X 12's and cut a slot in the block for it to sit in. And you may need to support the 2 bys in the middle depending on length needed.
Being straight in you should be able to stay on the boards. After you get the location figured for the boards mark the driveway so you know where to put them every time.