Manufacturer dry weight is generally the bare trailer. Then you have the weight as the dealer sells it, add awning, propane tanks and propane, battery, etc. This will add around 500 pounds to the manufacture dry weight, and may account for the weight difference you are seeing.
Usually when looking at trailers, you will find a sticker on the left front corner with the bare trailer weight and axle weights. Another sticker will be found in a kitchen cabinet door with options added, awning, propane, etc. This is a more true weight. For actual weight, you have to get it weighed yourself.
As for brakes, basically anything over 2000 pounds will have brakes, and they won't advertise that. That would be like advertising seat belts in a car. You will need a brake controller wired in to your tow vehicle to actuate the trailer brakes. Almost all are electric brakes, and the controller will handle that.
2012 Ford F250 ext. Cab 4x4
2002 Jeep Wrangler Sahara
2008 Yamaha V-Star 650 Classic
2008 Work and Play 18LT