A trailer mounted protection device (10) for protecting a vehicle (20) positioned on the trailer (18) from debris, the device including a first frame-enclosed panel (13A) and a second frame-enclosed panel (13B), each panel connected to the trailer (18), a first connecting assembly (40, 49A, 49B) for connecting a leading side (26A, 26B) of the frame (12A, 12B) of each panel (13A, 13B) to a forward part of the trailer (18), a second connecting assembly (71) for connecting a trailing side (28A, 28B) of the frame (12A, 12B) of each panel (13A, 13B) to a rearward part of the trailer (18), wherein at least one of the connecting assemblies is adjustable to enable connection of the device (10) to differently sized or differently shaped trailers.