He best be a suspension specialist. Although the trailway is maintained for snowmobiling it is also used by the locals all summer with heavy quad traffic. As such undulating is the nicest word i can think of but i have used stronger language.
I chatted with a couple from Maryland who crossed the island and she told me she never wanted to see another set of bumps/humps again. It tests your shocks and your straps.
If I still had every dollar I spent on motorbikes I would be a richer man but a poorer person.