Pictures are from the video posted by Nick Heintz of the Willowick Fire Department (OH) on the "Belt" method they find the easiest and quickest method to load the "S" or triple load. They also employ an interesting strategy to ensure that the line can be pulled from either side of the apparatus.
The connected, drained and stretched hose is held on the ground by a firefighter to ensure a length on single layer hose approximately equal to the width of the truck.
That firefighter pulls up the hose to their chest.
A second firefighter takes the hose at belt high an proceeds to walk the loop backwards hand over hand while the first firefighter pulls the stretched line hand over hand to "feed" the second firefighter.
The second firefighter continues walking the middle loop backwards at a slow pace.
The first firefighter continues to pull the stretched top line. They will be pulling twice as fast as the second firefighter (single length vs double length ie. pulley system - mechanical advantage)
The second firefighter ends their walk back when the loop they are pulling reaches the male coupling at the end of the hose.
The first fighter confirms that the beginning of the triple layer is on the ground where the single lay goes vertical.
Two additional firefighters should now help load with one on the far side of the apparatus and the other helping to pull the line while stacking them neatly as it is loaded.
The far side firefighter should ensure that the 3 layers are tight at the folds.
OPTIONAL: Use a length of webing tied in a loop to fasten a girth hitch behind the nozzle. The webing should be of sufficient length so that it can easily be pulled from one side but not too long as to creat a hazard.
OPTIONAL: By laying the top section of the triple load on its side it creates a clear indication that it is the end and can be pulled if deploying on the opposite side of the apparatus.
This last photo shows the webing on the exterior for an easy pull off of the side. (the video length is a bit too long - creating a hazard if the load is pulled from the opposite side of the apparatus.