Bunnings - 6 foot double sided ladder, most steps on rear side removed, the rear braced, steps then used on front side to make 6 inch steps which are much more comfortable for viewing. And an extra grab rail too.
A 6' ladder is plenty long enough for the 20".
On the negative side - this is a cheap ladder (around a hundred bucks or so) so it is on the heavy side - ArgoNavis's 8 foot is lighter (please comment AN). Also the steps are thick, which makes it possible to get your foot stuck!
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