Johnboatsone,
I don't disagree with the previous estimates, but I will offer a little more food for thought.
- On a boat/motor/trailer that old the value is determined by its condition and usability more than anything else. That means you need to either check everything or have everything checked by a knowledgable person.
- The most expensive thing to replace on that group is likely the motor. If it is bad or on its last legs it will likely cost you much more than $1500 to replace it with a reliable new motor. That is the item I would most want checked out well.
- Trailers are pretty simple. If its not rusted too bad, most parts can be repaired or replaced without too much expense. A good trailer alone can be worth $1500 if it of a size that lots of people want. If its a unique size that only works for your boat, its only valuable to you.
- Pontoon boats are also pretty simple. If the logs are water tight and the structure and decking are sound, the only thing else that could cost a bit is the furniture. You could easily spend $2-3000 on furniture should you need it. Factor that in to your value calculation.
My bottom line is that I think a 30 year old 14' pontoon boat with motor and trailer is worth about $4-5000 if everything is in excellent condition. Subtract from that what you think it will cost you to get everything into excellent condition and that is the most I would offer for it. For example, if the motor is shot, I'd offer $500.