Sunrise Guy,
We still do written bids, it's like the price tag on an item at Walmart, you dont expect to walk out of Walmart and pay in 30 days coz it's not written there do you?
Larger jobs generally have to issue you a work order or authority, you send that in with your estimate for payment, it's there internal mechanism that you got the job.
Guys, better than a contract is a before and after pic, phones have pic cameras these days and I can tell you when the client who wants to rip you off sees pics or video .... they **** themselves. Plus it gives you something to post about, your tree work. And you dont have to hassle anyone.
I have been stalled a few times but never ever stiffed, but I was a debt collector.