I wanted a ladder that would allow me to open my emergency exit window, so I got this wheel wrap ladder. You have to do some drilling on the bottom to install it, but once you have the parts, its pretty straight forward and I am able to still open the window. The only issue that I had was that the top of the ladder wanted to install where my rack was already bolted to the rails and so at first I couldn't install the ladder. Support said that it was because my rack (the low pro low roof 144 rack) was the old version. I bought it in 2022, but maybe they just released a new version. Anyway, support sent me some free adapter parts that allowed me to install the rack. Once installed, it seems very sturdy and I'm happy with it. If you're going to buy this ladder and one of the feet of your rack is bolted to the rail near the window seam, I'd contact support and ask about the adapter parts which consisted of some longer bolts and a spacer to go under the top-right part of the ladder.