"The LHT does not come with 650c wheels. It is either 700c in sizes 56 and larger or 26inch in sizes 54 and smaller."

Which is one pretty good reason to prefer it if you fit the smaller wheels. The hot money these days is with MTB wheels, though 700C do ride great also. If the wheel size is based on rider size it becomes very compelling to go with the 26" wheels.

The one problem with second hand bikes are the number of people with who clearly saw dollars floating in front of their eyes and end up with the wrong thing, often size problems. Maybe in this case there is a function issue also. If you are doing test rides take full panniers and water. Bikes can hold their mechanical value almost indefinetly. I've seen canoes that were trashed the first trip they were on, bikes can hold up for decades.