Good catch on the safety factor.
Brand new class 8 sleeper trucks are required to be equipped with a sleeper net. (occupant restraint system!)
Not a bad idea to pull it out of its plastic bag and using the hooks installed around the sleeper or bunk opening, put it in place and leave it there when the kiddos (or anyone) are riding in the bunk.
This net might be stuffed under the mattress or in a sidebox. While you are looking for it, make sure your hazard kit (triangles, spare fuse kit, etc) and fire extinguisher plus bumper hooks (if equipped) and owner's manuals are all there.
Your dealer SHOULD spend some quality time with you, and especially should go over the customer delivery checklist to make sure everything is there, and everything is working.