I don't know if it's useful information, but since Scott was saying....and Carl figured it, the way I load brush is to wire choker it in bundles, 4-6 per load. The first sits way out towards the rear, the next dropped in front, rear, front, rear, front, then one on top, or so....open to change without notice.
The boom presses down during the process when the brush gets high enough to pack in, and also is real useful for sweeping overhang in from the sides, Trying to cut all the brush about the same length, a meter and a half or thereabouts, helps to maximize how much will go in. The boom gets lowered down to hold it, roped if necessary, then too much sticking out gets trimmed. Ready to roll...
I wouldn't attempt to haul brush on a regular basis without the crane on top of the truck, both to bring in the chokered bundles if a larger crane isn't on site, plus for the packing.
Sorry if I'm giving standard everybody knows it info, but I haven't worked with enough other people to see how they do it. I have worked with a few who seem to load without rhyme or reason, and also see that approach on the road sometimes. Seeing how much you can get in is good for a laugh too. A nicely packed truck is a pretty thing, maybe that's why I've never been written up, technically the load should be covered over here.
I'd be curious to see how the time factor would compare with hauling as opposed to chipping. It seems like with chipping you need more people? Even one guy and a mini, the loading goes pretty quick.