I don't typically write reviews, but I figured I could probably save some people some serious headache and frustration on this one. I give this product 4 stars instead of 5 only because the instructions where lacking information and the company tech department was very helpful.I installed this on a 2017 tacoma access cab long bed. My bed may be a little different because the truck originally came with the Tri-fold tonneau cover, which I had to add some plates to the where the tonneau cover was mounted since the bed caps had a notch in them and where compressing too much when clamping this thing down. Also not sure if the top rail in front of the cab is the same as it would be without the cover, but...First off, you want to make sure this is mounted flush with the front of your bed near the cab. I would recommend lightly clamping it down until you get it all buttoned together, then adjust where you permanently mount it once you get your tailgate alight right with the rear window bottom seal. Tailgate should close with ease.Secondly, you want to start with the rear window, which was fairly easy and the instructions tell you the same. They don't really specify how the rear bottom cross bar goes in, but I have it so that the seal is pointing downward and you have to rotate it into place to clip into the side mounts.The side windows where the huge headache to get in initially. I had broken one of the zippers first attempt, but got Amazon to send me an entire new top. Second attempt, I used silicon spray to lubricate the top channel. I used a can with a straw sprayer and only got it in to the top channel of the window. I imagine this could get messy if not carefull, and also think that dish soap would even work. You need slide the top channel for the window all the way through from the back. The channel on the actual cover(not window) is segmented, so once you get through the first segment, I had better luck bringing the window past the next segment by a 1/2" or so, and clipping it in, then sliding the rest of the way until the next segment and so on.After the window was in place, I aligned it to zip up in the front near the cab. After it was zipped, I went to the back and pulled it as far back as I possibly could to get it as close to the rear zipper as possible. once I got it close, I un-secured the rear corner of that side and zipped to be able to zip up the rear zipper.Lastly, there are 2 elastic hoops they tell you to install on the rear top cross-member. Didn't think much about it when installing them, but you want to install them on the top left and right corners. This allows you to roll up the rear window and loop the elastic round to hold in place. This is necessary it is hot out and I am taking my dog somewhere in the bed.All and all, now that I figured on the kinks, I am very happy with this topper. I think it would be easier to un-bolt in for removal, rather than pull the window out to make it convertible. I did however notice that the side windows came out very easily once I had the original top on for about a week. I think it stretches a bit after being installed, just haven't tried to pull out the windows and put back in since replacement.