A panel truck is a winowless cargo van built on a truck chassis. Similar in function to its smaller cousin, the sedan delivery; which is a station wagon with no backseat, and no side windows aft of the front doors. Both types of vehicles are frequently used for delivery of flowers, retail bakery products, diapers, laundry, and other consumer conveniences. Panel trucks are often used by construction and maintenance contractors and were sometimes configured for ambulance and hearse roles. Other variations include Canopy express models, which have open display areas behind the driver's seat primarily used by farmers for selling fruits and vegetables. The Chevrolet Suburban and GMC Yukon, as well as the International Harvester Travelall were passenger versions of these trucks. In modern times minivans have been adapted to some of these functions.