| Keep the cargo as far away from the ground as possible | |
| Concentrate the cargo at the front and back of the rig | |
| Concentrate the cargo to one side of the rig | |
| Keep the cargo as close to the ground as possible |
| Fully raised with the crank handle secured | |
| 3/4 raised with the crank handle removed | |
| 3/4 raised with the crank handle secured | |
| Fully raised with the crank handle removed |
| Supplies air to the footbrake or trailer handbrake | |
| Provides a backup route from the air compressor to the air tanks | |
| Carries air controlled by the footbrake or trailer handbrake | |
| Supplies air to the trailer air tanks |