Having bought many projects over the years, several real estate, none a molded trailer, here's one lesson I have learned.
Start with a blank sheet of paper and add up the positives you can see, and put a value next to each positive. If you focus on just the negatives first, you won't notice the positives.
1. molded fiberglass body: appears to be all there and in pretty good condition.
2. Nice windows
, love those that open from the bottom.
3. Front window rock guard
, unknown condition with outside refrigerator
5. Rear cargo door.
Everything else is a project, but is this "starter kit" worth $1500 to you? If I was close, I'd give it strong consideration.
Good luck with the sale!