Well, there's a good chance that maybe this fag prostitute tried to proposition this truck driver, and maybe this particular truck driver called him a fag or something? Things escalated until the trucker tried to leave, but the faggot wasn't finished with him, so he jumps onto the damned truck. Or it's possible that the trucker was trying to avoid paying for the fag's "services", and the fag caught him trying to drive off and jumped on. Or it's just Florida Man up to no good again, as usual.