We currently own a 2013 Rockwood mini lite 2109s and have been very happy with it and how it tows, no complaints. It has travelled a good distance, two major trips every year and lots of little ones ...
Try this... Take 900 lbs tongue weight and subtract it from the total payload rating on the sticker inside the driver door of the truck. Now subtract the rough weight of passengers and anything going in the bed. How much is left? Almost always trucks run out of payload before pulling capacity.