Did I mention I used to be a professional ladder monikey
I've done 2 rungs (each a foot apart) above the roof but 3 is recommended for safety.
That is why I recommended 14 feet (one foot for The Pythagorean theorem 10 feet for the roof and 3 for safety)
How to "Set" the ladder (proper slope) To get the slant or slope of the ladder right you need a handy Dandy Slope gauge Thankfully you have one... Built in.
With your toes just touching the ladder's "Feet" reach out and grab a rung.
IF you just barely touch it with your fingers.. Too "flat" move feet closer to trailer.
If you have to bend your ram (or the rung hits your wrist) move feet farther from trailer
If, with your arm fully extended the rung falls nicely in the palm of your hand so you grip it like you'd grip it climbing.. Good to go
Be sure to secure the top when you get there Least it blow over and strand you.
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times