Abstract: A door assembly for providing access between the interior of a pick-up truck passenger compartment or cab and the interior of a camper enclosure mounted on the load-carrying bed of the truck; the door assembly including a one-piece generally rectangular shaped door frame extending substantially the entire height of the cab interior and secured around the periphery thereof to the rearward side of the cab, a door hingedly mounted along a generally vertically extending axis so as to be movable between a closed position arranged generally coplanar with the rearward side of the cab and an open position extending outwardly into the camper compartment, a first sealing element extending between the door frame and the camper enclosure, and a second sealing element cooperable with the first element and sealingly engageable with the door when it is in its closed position.