Myself I find different types of ladders most suited for the task in hand are still essential bits of kit to carry in/on the van and use when required. I still see "ladderless window cleaners" on vans that makes me chuckle especially when they have a set of ladders on the roof rack. ...Obviously they did not think that one through
Regarding pricing I would allow extra for any ladder work in the quote be it
Plastics & glass restoration work
Roofline - Roof valley/gutter clearing & cleaning fascia etc
Conservatory valet - Inside & out
Access to flat/pitched roofs
And generally any combined ladder, wfp or guttervac work.
I like to price jobs well so can do less for more reward as they say.