I worked for a top rated custom trailer manufacturer (Tracer Trailers) for a number of years, and I have to say that the fears about aluminum trailers and their durability off road are well founded. We found early on that you need plenty of sub frame support and plenty of re-enforcement at critical areas like rear openings and side doors etc.
Haven't really kept up with what's on the market, but I'm sure you'll get what you pay for.
I have two Featherlite trailers for hauling my horse's. Been real happy with them, but on a side note, some of the most indestructible looking trailer's I saw back 25-30 years ago were the Eby's.
