There have been a few convertible pickup trucks put into production. In this question and answer session, I show a few examples of topless pickups, using friends’ articles from Hagerty as well as my own from New Atlas to illustrate.
Hagerty Article about the Dodge Dakota: https://www.hagerty.com/articles-videos/articles/2018/06/27/1989-91-dodge-dakota-sport-convertible
Hagerty Article about the Chevrolet SSR: https://www.hagerty.com/articles-videos/articles/2018/09/27/retro-sport-truck-chevrolet-ssr-hot-collector
New Atlas article about the Jeep Gladiator: https://newatlas.com/2020-jeep-gladiator-first-drive/59127/