Not a movie but a series… The highway men or something like that. Sort of a mad max inspired series about guys in a truck and one of the trucks could become a helicopter or something? I think it failed after one season.

Anyway, there was an episode where a UFO crashed, the guy had to transport the pilot alien in his trailer and he had a camera in there and the alien, covered by plastic, sat upright.

Didn’t sleep for weeks, still haunts me 40 years later