I am assuming that it is aluminum if it is a Featherlite. Really watch for cracking, once those older trailers start cracking they fall apart. We used one on the ranch and completely tore it apart, the back of it fell and bulls went somersaulting down the road. Granted we thrash a trailer pretty hard, so maybe consider the life it has before.
I have a friend that works for a trailer dealership and they get quite a few older Featherlites in for repairs, same with the newer Exiss trailers and some models and years of Sundowners.
A couple of weeks ago I looked at a brand new Sundowner and they seemed to have changed their design and they look like a pretty sturdy trailer. I really liked the framing and the door hinges. Not sure when they changed that stuff though.
The older Titans were great trailers! A friend bought a brand new one a couple years ago and it is falling apart already. He hasn't hauled much cattle in it either, mostly horses. But again going up and down dirt wash boarded roads is hard on any trailer.
Trailers are like trucks, they all have their bad years and models...you just have to sort through it!