Forum:KB:Gr-75 Rebel Transport loading freight?

So I'm wondering if anyone has come across anything that describes how these ships, (the clam shell shaped ones) were loaded/unloaded with their cargo pods and container modules that hang up under the hull. I think that looks really cool on the studio model by the way, but hardly gets shown in the film. I know they are held there in place by an EMF, but are these pods repulsor equipped, or are they just towed to it on a flatbed by a tractor or something. Then how do they get put up into position?

I know it's a long shot, but I have to ask the question. Cheers