This explain how to add a new vehicle to the H&M system (cargo, reputation, data base (save vehicle status, cargo ammo and objects loaded)…).
If the vehicle is destroyed, a wreck will be left. You will need to tow or lift it to the logistic point for a fully repair.
You can add new vehicle in the mision.sqm :
A garage is available for admin only. Activate the garage through mission parameter. Then if you are admin, you will be allow to spawn a vehicle by interacting with the logisitc point box.
You can add a new vehicle/boat to respawn system by:
Note: you can tweak respawn time here: /core/init_server.sqf L42 by changing 30s to what you want.