A lot will be determined by where you live. That is a great trailer, but it is small. I would get on craigslist and search for small trailers of all makes. After you get a small list, look at their numbers and adjust yours for year.
Our local craigslist had 16 RVs listed that were 2003 models. They ran from $5,000 (hybrid) up to $9500 (32' fifth wheel).
I know that doesn't give you exact pricing, but that would be my starting point.
2017 Ford F350 Crew Cab 6.7L 4x4 DRW