But this is where some earlier statements come into play .. if I'm not there and you pick it up and claim its damaged, I could say it wasn't.
If you don't figure this part out, you may be lining yourself up for some grief. I'm not saying it would happen .. but in my opinion, the 1st time it does and you're not prepared, you'll hate it.
I agree with you on trying to be prepared. I'm really not that worried about damage. It's going to happen and should be built into the cost of doing business. My instinct says that if I handle delivery/pickup AND I configure the sound system and lock off the controls so that all they can do is plug in an ipod or stand in front of a mic stand to speak, I should (hopefully) eliminate the bulk of the problem. It's not too much unlike when I added uplighting. I really figured I'd have a good bit of problem with fixtures getting stepped on or kids kicking/breaking fixtures but I've only lost 1 fixtures out of 40 and that's after 3-4 years of operation. I think if you configure your gear properly you're going to minimize problems (stating the obvious). The rest are just a cost of doing business and we'll take those on one at a time.