tall ladder (Edmonton Green N9)

We already have a stepladder in case thats what youre thinking; more like whats pictured is what we need - something that can get us at least one person in height higher up a wall, to work on some window frames.

Only necessities are that it needs to be long and CAN lean against a wall.
Extendable is desirable but not critical
It having a supporting leg so it can free stand as a ∆ triangle is also desirable but not critical
Can you help with this request?
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