i saw this on HBO in 1996.

there were two characters – drifters – who meet up on the road and start traveling together.  one of them is a straight-laced serial killer who tapes knives to his hands. the other is a brad pitt looking actor who is charming and witty in that 90s cool criminal kind of way who has stolen money from the mob.

i remember a scene where the young one meets a hippy couple and has sex with the woman in their van while her boyfriend watched.  they are then seen murdered the next day.

there is a twist ending in that you are led to believe it is the young man who is the killer and the suited man who stole the mob money but it is really opposite.