I would stay away from any aluminum trailer. They tend to crack at there weld jionts, and they corroid. The seller usually try to push the lower weight, but it is not that big of an advantage. You might save 400-500 lbs, but for what? To brag about having an alm trailer? The 500lbs is nothing , you couldn't tell the difference it you pulled a 5000 lb trailer or a 5500 lb trailer. The big rigs use alm trailers so the can haul more, they will not have them in service that long, and in there world, cargo capacity is everything (money). I sell trailers, and would not have one on the lot. Most people think they are getting something better because it sells for more. But what they are getting is seldom what they expect. Trailers do an awfull lot of flexing, the aluminum trailer just don't take kindly to it, they tend to develope stress fractures, and most of them you will not be able to see(trailers are very low, and not meany craw under to inspect).