Loading DropShips

I'm trying to understand some of the rules for MS&R as it applies to loading dropships. Where in the various books are the rules covering the loading of dropships? How is this done, and I am aware it might differ between different types (both aerodyne/sphere and say Union vs Leopard vs anything else). I am aware dropships also have a differing number of bays and doors, how does this factor in, how many can load at a time, how long does it take to load, etc?

Obviously I am also interested in unloading too!