Done
http://www.imcdb.org/movie_105665-Twin-Peaks--Fire-Walk-with-Me.html

http://img168.imageshack.us/my.php?image=tw09.jpg http://img259.imageshack.us/img259/8310/tw12.th.jpg

1956 Buick. It's a Coupe.
In 2nd. thumbnail I can see 4 portholes so: Super; Riviera; Roadmaster or Century.
Century and Super (Riviera) had its chromed name in the side after the door and the car in side view hasn't.
Inside Roadmaster Series
http://buicks.net/years/56.shtml there is a Two Door Riviera. And I go for it
1956 Buick Roadmaster Riviera 2-Door [76-R] http://www.oldcarbrochures.com/main.php?g2_itemId=8541

The "Datsun" is actually a mid-1970's Toyota Hilux, with a Chinook mini-motor home body mounted on the back.

the white car is a 1957 buick
and the camper is a 1970 boles arrow

The blue convertible is a 1975 Chevrolet Caprice

http://www.imdb.com/title/tt0105665/

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sedan (***)



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Fiat (*)



Datsun? (**)





Chevrolet Corvette (**)



Harley Davidson (***)



other stuff: