Since the seller said "IN person, Cash only" I doubt it is a scam (This is good) but, and this fits well with his request for "In person" I'd want to lay Eyes on.
Someone else gave you the NADA book on it... So pay it a visit, look for any flaws or cracks or issues.. Check for rotted wood, Make sure battery works to run it up and down. Do a full "PDI" type run through while you are at it, and then use any flaws to talk him down on price.
I really wanted a Hi-Lo back in my trailer days but alas, was not to be.. So instead I ended up with the rig below.. It does not do LOW well.
