I've found 'ladder jacks' online that can be attached to ladders so you can put a board between them, but didn't find any on the Bunnings website.
Does Bunnings sell any hardware that can be used to make a platform between two extension ladders.
I'm looking for a low cost scaffolding solution for a one time project, I already have 2 extension ladders.
Renting scaffolding would get expensive as I only have a couple hours a day every so often so the project may take a couple weeks.