Can I just sleep in the back of my truck?:p

You will be cold, but yes :)

Yes you can but you need to get a camp spot first and be prepared with a nice sleeping bag cause will be cold at night.

It wouldn't be the first time, but you will have to get a space to do so, the lot is closed over night

Really a lot of morning dew . You would be so wet in the back of the truck unless it is covered.