I do not know the type of roof lift in your camper. Is it anyhthing like the Rieco Titan system described here? With independent actuators?
https://www.truckcampermagazine.com/news/rieco-titan-on-palomino-rv-s-new-lift-system/page 7 of this PDF deals with their manual crank override:
http://www.riecotitan.com/flyers/erls_2015.pdfOr does it use a single lift motor and cables? Can you describe the operating principle?
A few pictures of your system might help to extract some more information from the crowd. It was probably not limited to Travelite.