I have an older Escapade an consider it worth around $1K. If the one you are looking at is in nice condition I would say it's worth it.
Check for any damage underneath. Mine had a crack in the rear, down low as if it had been hit or backed over something. Also I had to replace the tires. They had aged out.
Also if the color matches your bike that makes it more attractive.
There are 2 sizes of the Escapade trailer and they had several extras, like Cooler rack, front bra, inside clothing bag attached to the inside of the lid and a few others, Do you have any pictures of the trailer and a description?