It looks really nice.
You'll find a buyer regardless, but for anyone with experience, anytime anyone says "I never used
x appliance but I was told it works", that means
it does not work.
These tend to sell for between $5,000 - $15,000, depending on the condition. If things don't work and/or there's mold, the price starts falling toward the lower end of that range.
This website is a great place to post it
for sale, but also to see what similar trailers are going for, or have
sold for. There are tabs for US, Canada, and trailers which have
sold in the past. You'll be able to find some 19' trailers to compare.
I love those 19' Bigfoots, by the way. If I had a bigger truck, I'd be interested.