Interesting all of this. So they really are that light weight. I was about to say that they must be really thin gauge, and then maybe subject to damage, and Martyn confirmed that. I think the Conquerors are built more for rough road usage, not trail usage. And that doesn't necessarily mean that they won't hold up long term. Modern unibody cars are vastly stiffer/weight than an old solid frame car. But no one point on the body is capable of taking an impact load the same way you can on a frame.
Then I'm not so discouraged with the weight of mine. It will be much stouter than the Conqueror. Since I've got only 16-18" of ground clearance, I designed it to be really solid underneath with a smooth 14ga metal surface to be dragged/winched over anything. But it's not intended for the Rubicon either, as then it would just be a winchfest. But if I'm on a trail with a few tough spots, I can drag it over.
I'm hoping it'll be 2000-2500 fully loaded, but the frame will be capable of 3500 for road use when I'm hauling dirt bikes on the tongue.