We have two fiberglass extension ladders made by the same company, and I decided to make a standoff that will fit both of them. I finally finished it today. It is made from 1-1/2″ PVC pipe and anchored to the ladder with a 36″ piece of 1/2″ allthread that runs through a ladder rung and clamps the standoff securely to the ladder rails.
The “V” shape in the center allows the ladder to be placed against the corner of a building or a tree (or utility pole) without slipping.
Ironically, the reason I initially set out to make this was to inspect the roof and make repairs to the gutters, but we had that done by a professional roofer. I finished the standoff anyway, because I’m sure that some sot of adventure awaits for which this is the perfect solution.