Camping and Telescope, but novice and sleeping in the car?

My kiddo really wants to disconnect for at least a night. We are Farragut based.

Where ever we go, I would like vehicle access. We have a one person tent and one sleeping bag. Can't afford anything extra, so we'll just decide who gets the tent and who gets the car once we are there haha.

I already have food ideas as we won't have a fire. I want to take them to spot where we can finally use the Telescope they got for Xmas. I made a post about places to see the stars before, I hadn't considered camping though. I'd love some suggestions. Thank you in advance.