Trouble is dealing in cash, a majority of the time, - it builds up, then before you know it - customer has wracked up a bill. How you solve this - im not sure???. Card payment on route I think is the way forward. Dealing with cash payments is tricky, I think your always going to be on the back foot. But, theres alot of chaps now taking payment by paypal, its the way to go - cut cash payments out...... I dont know.