how many hours on it? do the hours shown appear to match the condition of the boat? Is the owner a fanatic for keeping things in shape etc--does it show on the boat? how is the interior (can be costly to repair) . how is the gel coat re scratches etc , the rub rails. Whnat condition is the trailer in ? tandem or single axle?
above all else always insist on a compression check of the cylinders! Saved myself from a big mistake one time on that one alone!!!!
Times are tough---- ask him what he really wants to get out of it ? you might be surprised.