It was a pretty strong gust that closed the clamshell for me. The mounted poster will add a bit of weight as well. Sometimes our car shows here have a little cooler weather than Florida or Texas. This can affect the hydraulics, which seem to do quite well when it's warm, but I'm keeping my eye on them for replacement when due. Thanks. Do you have a source, brand, part #? Without the dealership premium for the same item?