Politically, I don't there's anything wrong with mentioning your wife drives a Cadillac. But it's a little riskier if you mention she drives "a couple".
Mitt Romney, in his speech to the Detroit Economic Club.
"I drive a Mustang and a Chevy pickup truck. Ann drives a couple of Cadillacs, actually."
(P.S. "Trees are the right height" makes a cameo).