I played with one for a couple weeks last fall in AZ. Conqueror is coming back to the US with a new owner in Mesa, AZ. Roll-out of updated models coming soon.
As for the offroad-worthiness, they're legit. Basically, anywhere you're willing to tow it, it'll go. The air bag suspension I had on the model I field tested was a lot of fun, and because of that I'd buy that upgrade every time it was offered on my future trailer purchases. Makes for plenty of clearance and super simple campsite leveling. I have a RAM 1500 Rebel and it towed VERY nicely, on and off-road. It's built to make the forest road washboard towing super simple without wearing the trailer down with repeated chattering, and on the more challenging terrain, the low center of gravity of the pop top and water tank position made it confidence inspiring over the rocks. Overbuilt underneath, even if you scrape stuff, it would be tough to do real damage to the trailer. I'm attaching a few pics. I didn't do any rock crawling with it (I'm not equipped for crawling with my truck yet, anyway; still a work in progress), but the trailer tracks SO nicely with the truck, that more aggressive trails would be very doable. Obviously you don't want to do anything stupid with a 15 ft. 3700 lbs. (loaded with gear and water) trailer attached to your tow vehicle, but anything within reason could be attempted without fear of the trailer failing you. It'll get some scratches if you take it through tight passages, but it'll hold up. I'm not afraid of a little pinstriping on my equipment, though.
All that being said, I don't own one, and it wasn't the trailer for us, but none of those reasons have anything to do with the toughness of the trailer. That side of it is unparalleled. You could argue other brands are made equally as well, but it would be tough to say they're built better.
In front of the house, on the pavement, where it doesn't belong. You can see that the breakover angle of the trailer is actually better than the truck on its own (again, stock Rebel), and the suspension and rock guards are just as beefy. Note that the near wheels are on my curb, so it looks a little less level than it actually was when we hooked it up.
Here's the Viair onboard compressor for the air ride. That thing was legit. It's now a mandatory upgrade for all future trailers for me.
We actually took it to a campground for a weekend to play with it and set it up the first time before getting it offroad. I know, pavement pics are lame. We loved the awnings once set up, but my wife (pictured; the one with two legs) said there was no way she could have set them up on her own. She wasn't tall enough. I'm 6'3" and could easily get it done myself, though. Took about 10-12 mins to get both sides up and posts adjusted. So. Much. Shade. It was chilly (Thanksgiving weekend), so Perry chose the sun anyway.
Rutty dirt roads were no challenge. I didn't own the trailer, so I didn't go nuts, but you could tell the Conqueror would follow me anywhere.
The 360* awning makes for an awesome basecamp. The solar panels kept me at full charge the whole weekend, though it was cooler, so the fridge wasn't working too hard.
We didn't really need it, but we wanted to set up the walls on one side just to see how much of a pain it was, and I gotta say, it wasn't that bad. First time doing it without any instructions took us about 30 mins to get it all set up. I wouldn't do it again for an overnighter or a weekend trip, but if you were gonna be somewhere for a few days around others (think opening weekend of hunting season; I don't hunt, but the use case is real), then taking the time to put up the walls would be worth it. Took about 20 mins to take down and fold everything up. Nice feature: all the walls are square, making folding them and putting them back in the duffels quite easy with two people. We also didn't spend a ton of time adjusting to make everything look pretty.