@HankLloydRight - finally, don't be afraid to think outside the box in terms of who your customers are. Don't believe that age and credit status automatically correlated to "won't wreck my car" risk.
Personally I'm a contrarian. I made tons of money off guys who:
1 - Were under 25, and
2 - Did not have credit cards or had credit bad enough they could not get financing to buy the luxury/exotic they wanted.
My experience was the young guys and the credit-challenged were simply very grateful that someone would let them rent a nice car - and I never had problems with them. I never had any problems either with the guys who I am quite sure were various types of criminals. I certainly charged high security deposits for the young guys. One 21 year old materials science undergrad at Cal Tech had a very rich daddy who owned a chemical manufacturing company back in Taiwan. Baby boy had an Amex black card and no problem putting down a $10K deposit to keep a Ferrari parked outside his dorm room - he paid $5,000 per month on a month-to-month rental and got only 500 miles. Never wrecked my car or abused it. Another guy was only 20, also had a very high limit credit card, and liked taking my Bentley GT to various events around L.A. Never had a problem with him.
Another guy was, I think, some kind of pyramid scheme scammer - he paid $8,000 per month for a long term Bentley rental. He was a hassle of a customer - I'd have to frequently send employees banging on his door to collect, threatening to take the car back, etc. But he paid. And for $8,000 a month for a car worth only $100K at the time - he was worth the hassle.
Had several gentleman who mysteriously needed to pay in cash - but they had drivers licenses, insurance, had no problem with me knowing where they lived. Never had a problem.
I have also experienced, counterintuitively, that in my experience convicted felons have been the most stable, on-time paying residential real estate tenants.
Just my two cents
