The first 12.5 foot slide topper was delivered, but severely damaged by the carrier. Camping World was immediately notified and processed a new order. The second one arrived safe and sound (about 10 days). Upon removal from the long shipping tube, I found that the manufacturer had failed to include any installation instructions (none at all). And, I could find no installation instructions on line. But, since I am a die hard do-it-yourselfer, I persisted and watched the handy on line-video (YouTube) and figured it out. Please note that those guys used scaffolding, while I used a ladder. Miraculously, I installed it completely by myself. It works fine and no one was hurt in the process. You really should have someone to help you, especially when you are about to slide it into the track. You will also need an industrial grade pop riveter to install those super heavy duty pop rivets.