He decided not to go for the extra range. They shared the LSP data with me, took it on a longish test drive, and did some math and decided it looked ok. So they bought the 2015 at a slightly better price (under $8K).
Thanks all for comments!
Did the LeafSpy Data look good for it? If they are driving "up" to those heights for climbing, they would have no issue doing regen all the way down