Looking for the name of a vintage porn movie, please read desciption.

The movie starts with a man in a motel who starts having sex with a girl on the table, he gets kicked out eventually and goes to stop cars on the highway, a couple picks him up and a girl starts flirting with him, for some reason I don't remember the guy gets pissed, slows down and a fight ensues, after the whole ordeal the main character finds himself stranded on a farm and trades food and shelter in change for work. The wife of the farmer has taken a liking in him and one day climbs on the top floor of the barn where the main character is in order to have sex with him, the intercourse is so violent the barn starts shaking and the owner of the ranch finds the clothes of his wife inder the main ladder and catches the two. The final crescendo that I remember is the main character going to some radio station and fucking the radio station big titty chick in a bathtub.

Whoever got here I love you and please help. The movie isn't that full of porn scenes, but I do like it.