I tried to ride some of the gladwin trails last year by myself on my gs 650. That sand is deep without reprieve! I struggled mightily to ride 50 feet and I am not exaggerating. Dropped my bike at a weird angle and couldn’t pick it up. Luckily 2 guys on 4 wheelers stopped and helped me. I ended up riding the nearby roads which was enough sand challenge for me that day. As Jeff mentioned the roads are pretty sandy too.