53' Used Wabash Dry Van Trailer

Stepping a little out of my element here, but I'm trying to help out a trucker friend who is in need and is trying to sell his trailer. His truck broke down, and we helped him to a cross dock transfer at our warehouse. He is trying to move in a new direction, but needs to sell this trailer. I would appreciate any tips for how to help make this happen.
I won't lie, it's been used, for sure. Plenty of rust, a tricky door, a rusted out hinge, and a pretty scratched up floor. But I unloaded a full load out of it myself, and it supported a 5000 lb forklift with no problem. No leaks (it just rained). Appears to be a reliable trailer that just needs some touch ups. Is $4500 a reasonable asking price?