All of the following are acceptable methods of transporting Class 2 hazmat, EXCEPT:

A Leaning against the wall at a 45 degree angle.

explanation

Class 2 (compressed gases) including cryogenic liquids:
If your vehicle does not have racks to hold cylinders, the cargo space floor must be flat. The cylinders must be:
- Held upright or braced lying down flat, or
- In racks attached to the vehicle, or
- In boxes that will keep them from turning over.