After packages are stowed, what closing and weather-protection step belongs to Theme 13 handling?

1. Leave load doors open on the motorway so vapours disperse
2. Close and secure the cargo compartment, keep packages dry and protected from sparks and weather, and do not use the roof as a walking surface on unsecured drums
3. Cover labels with tarpaulin advertising so competitors cannot see the class
4. Store spare leaking samples on the dashboard