we don't do anything at all by ladder and we don't even climb gates (arrange access via email) not only for the reason you have outlined above, but because it is so much slower, we do noticeably a lot more in a day after changing to this, no hanging around, nothing hard whatsoever, just park clean and drive off, without hurting ourselves on ladders.
i am a strong believer that nearly all customers can be converted when sold the right way, we say if its no 100% right you wont pay a penny. so far such a thing has never happened