I tend to agree. I think once it's wet, probably doesn't matter metal or wood. They BOTH can be slimy. My present trailer is wood, because "that's what I found" used at a good buy. I cannot afford a fancy one. This one is about 22-2500 new, I paid I think 1100 for it used.
Metal is more hardy, if you are doing stuff like dragging wrecks up on with no wheels/ tires