(About man-on-man sex in printed gay porn, so not suitable for kids or the sexually modest)
Caught on Pinterest a little while back, this gay pulp novel from 1983:
(#1) Apparently, the young man — the piece of chicken — is offering to service the trucker’s erection; though the boy’s buttocks are prominently displayed on the cover, fellatio (rather than anal intercourse) is the conventional service in truck-stop sexual encounters (I know nothing about the actual story, or about its no doubt pseudonymous author Michael Scott)
So: three things here: chickens (and the men who seek them out); truck-stop sex; and the gay pulps, in particular the Adam’s Gay Readers of the 1980s (the series to which Trucker’s Chicken belongs).