CORAL GABLES, Fla. -- Founded in the 1920s as a fantasyland of Mediterranean architecture, this affluent Miami suburb, one of the nation's first planned communities, has a long-standing reputation for zealous aesthetic policing, ruling over everything from hedge heights to what colors residents may paint their homes. Now a guy in a pickup truck is threatening the social order. Lowell Kuvin, 44, wound up on the wrong side of the local code one night four years ago when he parked his forest-green 1993 Ford F-150 outside the house he was renting. The city defines pickup trucks, even those for personal...