Trail Overview
Level 1, besides one water crossing, which I'd give a 2 for a 4x4, single track wide, mostly rough gravel, overgrown slightly, will cause some scraping on the paint, it's maintained a little bit with clearing trees that fell, starts in Stafford Springs, Connecticut then ends in Hampden Massachusetts. The water crossing was about 17 inches deep, and the bottom is mostly rocks, making it good for traction.
Difficulty
The road is a single vehicle wide. The water crossing is the only thing that increases the difficulty. In the winter, I'm sure this is not maintained, so that would make it much harder.