Re: 1982 Harris 24 ft $$$$
If this boat is very nice and runs real well I think it is worth the $5k around here in South Central PA.
About any roadworthy pontoon trailer is worth a grand.
I sold a '79 50 Evinrude to the first guy that looked at it last Spring for $750, so the motor is probably worth close to a grand.
That being said do all the screening that the guys above have suggested and remember that a guy selling a boat in March NEEDS to sell it. I never expect to pay a dime more that 80% of the asking price for any boat or vehicle, and regardless of the condition I would start any offer at about 60% of the asking price.
Other significant factors are: canvas? covers? electronics? life jackets and other equipment?
Did they recarpet with good stuff or junk, same for the seats, wood bases are bad, rotocast plastic bases are good.
Those old Harris Floteboats were nice boats and held up well, I hope this one is in good shape and you can pick it up and join in all this 'tooning fun.