We recently were shopping around for a mover and it seems like most of them hire a local crew to palletize everything and move it to a depot where a second company trucks it to a depot near the destination and a third company is hired to move it from the depot to the destination.
Yup, this is how stuff ends up getting lost and delayed, even if the crews on either side are competent and efficient. Most people can't fill up an 18-wheeler, so some bin packing has to take place for the long haul.
I've done a couple of cross-country moves with a full house and had fairly good luck -- North American Van Lines if anyone is interested -- and by far the best experience was when my stuff was last into the truck making the long distance trip. It was delivered a few days later by the same truck and driver. Nothing was lost or broken. There was no chance to screw things up with intermediate transfers to depots.