Just remove one of the extensions if you dont need it.
30’ is bloody high, and youll need muscles like Popeye to extend the ladders so far.
When I were a lad.....my dad would hold the base ladder firmly, and pretty close to vertical. I’d then shin up the thing, pushing the extension as I went. Worked too!
John
The other way, if you have space, is to extend to the height needed laid on the ground, then an helper stands at the base of the ladder(just to act has a weight), whilst the other lifts what will become the top end and gradually walks forward lifting the ladder to meet his helper. You can even use the base of a building, the right angle to the ground, instead of a helper to raise a ladder.