Welcome to Mudcat Caleb !

Lighter, J.E., Random House Dictionary of the American Slang Vol. 1, A-G, p 693.

Lighter gives 18 examples from 1914 to 1985. Some are:

easy rider n. Black E. 1. a parasitical man usu. without a steady job who lives by gambling or spnging, (specif.) a man who is supported by a woman, esp. a prostitute.
1914 In Handy Blues Treasury 77: Dear Sue, you Easy Rider struck this burg today. 1919 Wiley Wildcat 53: Where at is my li'l easy rider gone? 1934 G.W. Lee Beale St. 76: The "sweet men" and "easy riders" hung out on the second floor. 1935 Pollock Und. Speaks: Easy rider, a per sho attempts to make a living by betting on horse races. 1948 McIlwaine Memphis 346 [ref. to 1909-1914]: To Beach [Street], easyriders meant pimps; to Main Street, political grafters and protected vice lords.
. 2.a. a sexually satisfying lover. 1927 Journ. Abnor. & Soc. Psych. XXII 16: Easy rider…a man who movements in coitus are easy and satisfying. b. a young woman who is sexually promiscuous or easily seduced. Also easy ride..
1971 Current Slang V 10: easy rider n. Girl who "gives everything" on a first date.
3. a guitar. 1946 Blesh Trumpets 128: In rural Nego parlance…easy rider meant the guitar…carried suspended by its cord. 1958 in OEDS.
1946. a person who is not easily ruffled or provoked.
1971 S. Stevens Way Uptown 45: If you show mad, someone goin' beat you all the time. You gotta be an easy rider.

Wiki's are usful - and the best pieces of Mudcat had elements at times. However, just like Mudcat you should require a valid SOURCE, there is a lot of capricious speculation passing for "fact."

Sincerely,
Gargoyle

Caleb - you ARE thinking - and according to Lighter - Back line medical corp in WWII were referred to as "CC Pushers." Language is always in flux.