As should be apparent from the drawings and the description above, the design disclosed and claimed herein is particularly applicable to a truck having a corresponding outwardly or rearwardly convex tailgate. The drawings disclose various additional designs via broken lines beyond that claimed herein, including, e.g., a design for a combination outwardly convex truck cap rear lift gate or window and corresponding outwardly or rearwardly convex tailgate or portion thereof, including, e.g., a design for a combination outwardly convex truck cap rear lift gate or window and corresponding outwardly or rearwardly convex tailgate cap portion as seen for example in