Great hike! I parked at the upper carriage parking lot which left a 2 mile loop (green trail up and blue down) to Belknap. There's a 1/2 mile spur to Gunstock off the blue trail. The trails are very well maintained and marked. Kudos to the Bratts! Definitely moderate, not difficult. A little foggy this morning, but there are wonderful views from both mountains.
Note the upper carriage road is dicey, but manageable in a mini-van if one is careful.
John P