Replying to Questions about camping at guardsman

My friends and I are coming to brighton for a few days and we're trying to keep this trip as cheap as possible, so we're planning on finding a spot to do some winter camping. I'm familiar with the Guardsman area but I have a few questions about the possible sketchiness of camping in a non-designated camping area like this.

1. How far up is guardman pass road open? I'm guessing up until the access gate but I want to make sure we can drive far enough in.

2. Any experience with parking overnight near that gate? Definitely dont want to get my car towed. that's probably my main concern out of all of these

3. Any ideas of the legality of camping up there? We'll be going far enough into the woods to get away from most people but I know its a popular snowmobile area and id like to avoid attracting any unwanted attention