Another vote for get it. A collapsible is easier to climb, yes, and movable to the point you need to access. It has its merits. A mounted ladder is convenient, as long as you are nimble enough to use it. I am on my roof at least 6 times a year. We were in a campground and had a small branch come down on my roof during a bad storm and poked a dime sized hole in the membrane I got up there and fixed it as soon as the rain stopped. Always carry some Eternabond tape. I used the mounted ladder. At another CG I had to replace a vent cover. I don't have one of those fancy collapsible ladders. Too expensive to justify the expense for me. My folding ladder from home is too much needless weight to justify taking it with us. SO.....as you can see there are pro's and con's to each one.