There is no combined list of all brands comparing weights or anything else. You have to consider which ones you like and then check their specs. Most brands offer rigs in several weight & price classes, to accommodate different needs. If you are at a dealer lot of a RV show, just look at the DOT rating plate, usually mounted near the front left side. It will show trailer GVWR, which is the number you want to use for estimating purposes. If looking on a web site, go to the manufacturer's site and click Specifications for the model of interest. It will show the GVWR there. IGNORE DRY WEIGHT!
You will see Dodges like yours towing all sorts of weights. It's a powerful machine and probably rated very conservatively as far as mechanical components are concerned. The heavier the loads carried/towed, the faster the drive train and suspension will wear, but it would probably still last a good long time. Safety is another matter, though. Emergency handling is one big factor - do you really want something three times your weight and twice your length pushing you around when that car pulls out 30 yards in front of you? Legalaity is another. It is most unlikely any cop would stop you, but if you were in an accident and found to be overweight, you have almost automatically become a contributor to the cause of the accident. That's a civil matter rather than criminal (unless somebody dies in the accident), but you could end up on the short end.