I have a set of triple ladders but mine are called 'combination' ladders. More versatile I feel. Like these:
https://www.laddersukdirect.co.uk/ladders/lfi-home-combination-ladder/f3tc
I have this stand off. https://www.diy.com/departments/mac-allister-ladder-stand-off/1491799_BQ.prd
https://www.laddersukdirect.co.uk/ladders/lfi-home-combination-ladder/f3tc
I have this stand off. https://www.diy.com/departments/mac-allister-ladder-stand-off/1491799_BQ.prd