“Driver carries no cash—he’s married” (bumper sticker)

“Driver carries n cash” is a popular bumper sticker. “Seen in the last few days in Xenia, a beer truck and a sausage-maker’s truck, both bearing painted warnings to would-be robbers that the driver carries no cash” was cited in print in 1971.
 
“Driver carries no cash—he’s married” is a popular version of the bumper sticker that has been cited in print since at least 1993.
 
 
29 June 1971, Xenia (OH) Daily Gazette, pg. 4, col. 3:
Sign of the times: Seen in the last few days in Xenia, a beer truck and a sausage-maker’s truck, both bearing painted warnings to would-be robbers that the driver carries no cash.
   
Google Books
Crossties
Railway Tie Association
Volume 69
1988 (This Google Books date might be incorrect.—ed.)
Pg. 96:
Sign on the Bluff City Ice Co. truck in Poplar Bluff, MO. “Driver carries no cash. He’s married.”
   
Google Groups: rec.humor
Bumper Sticker
Larry Fishbach
4/28/93
I still like the one I made up from a kit from an auto supply store.  I get favorable comments on it all the time suggesting I market it.
 
“Driver Carries No Cash - 2 Kids In College”
 
Google Groups: alt.sex.movies
Ashley Nickole?
Rick Christmas
9/12/93
(...)
. OLX 2.1 TD . NOTE:  Driver carries no cash—-he’s married!
 
17 November 1999, The Intelligencer (Doylestown, PA), “Cashless society” by Beth Long, pg. A3, col. 1:
I saw something on the way to work Tuesday that caught my eye.
It was on the back of the big tractor-trailer in front of me.
It read: “DRIVER CARRIES NO CASH—he’s married”
   
Google Books
San Diego Magazine
Volumes 52-53
2000
Pg. 192:
THE BOTTOM LINE: Dick Troncone met reality on the bumper of a sedan turning into the Navy Hospital parking lot: DRIVER CARRIES NO CASH— HE’S MARRIED.
 
Twitter
Alex
‏@alex49200
Ask your dad where he got his ‘Driver carries no cash… He’s married!!!’ sticker for me, buddy. pic.twitter.com/iv7SUOXwjT
7:16 AM - 17 Sep 2014