This is what I'm thinking of: 

My theory is that the time spent moving a forklift, telehandler, loader, or whatever all over the county would be more then enough to cover the slight unhandiness which would be inherent in handling the seed boxes with a crane on the service truck which i probably already there.  I guarantee the crane is worth having even if it doesn't get used for seed. 

I haven't used one of these, so it's possible that they are impossible to manage, but I'll have one if we decide to get a GP planter.