Trail conditions depend on weather. With lots of rain a wider tire will be useful, but with luck and moderate conditions, I'd not hesitate to take a road bike, and even less so a hybrid rather than a mountain bike. If I took a mountain bike it would have relatively smooth, narrow tires. The point about having good tires if you take a road bike is a good one. I use kevlar belts in nearly all of my tires to reduce flats from both spines and rocks, and especially when touring with added weight. Ride safely, Tom