I use a telescoping ladder like this:
You can extend on side of this longer than the other and you have a nice sturdy ladder that is solid on stairs. Folds up nicely as well.
I have three sizes. And appreciate their versatility. Putting a plank on this has it's built in limits as to where the plank can go. Almost makes sense! All the big boxes have them. So does Costco.
Mark
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