Anybody doing this? I want to generate an invoice on my laptop with quickbooks, print it off and stick it in the customers door, right from my truck. This way I KNOW they're getting their bills, and, best yet, if they're home, I'm gonna get one of those for my smartphone that lets me swipe credit cards.Also, if they pay by check, some of the bigger banks let you deposit checks by taking pictures of the check. I know it all sounds awesome, but this is my first year as a solo act, and I was wondering if anybody else has tried this, and how they're working. My truck has an A/C adapter in the bed, or I was going to use a power inverter to power my printer.