All 4 Doors are completely removable and have full length double pull zippers. Cab comes complete with necessary self adhesive Velcro , installation and care instructions. Elastic mounted clips are installed in high stress areas to help in colder climates where shrinkage may be problem to allow doors to zip properly and maintain tight fit. Doors can be removed for added ventilation on warmer days. Cabs do not have to be removed to trailer vehicle as long as all doors are zipped in place and cab is mounted properly. All cabs listed on our site are manufactured by our plant located in North Wilkesboro NC and utilize raw materials that are Made In USA and/or recycled/renewable resources when possible.