Forgot to mention - my grandfather has a 1990 Mazda 929 sedan. It also does this- rear lowers when in placed in drive and lifts in reverse. It too is a RWD car, with independent rear suspension.

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2004 Toyota Sequoia Limited 4wd
1991 Lincoln Town Car Executive
1991 Cadillac Sedan DeVille
1988 Mercedes 300SEL
1972 Chevrolet Caprice Kingswood Estate 9-passenger wagon
1973 Pontiac Grand Ville
(Prior MB's: 1974 240D, 1985 380SE, 1984 190D, 1993 400SEL)