Daton welcome to RV.net - I hope you understand the suggestions shared are not an attack at you at all, but rather a learning experience for many owners here. I can't even remember how many owners go out buy a bigger trailer only to find their truck really can't handle it safely then they are forced to upgrade their truck before they were really ready to.
As mentioned nothing will increase your limits, they will just provide better handling. No manufacturer will ever state that they will increase your specs in writing, though some unscrupulous sales guys will tell that to your face.
Toy Haulers, both 5er and Bumper Pull tend to have very high pin/hitch weights. Those weights can quickly outpace the limits of a 1500 truck. The other factor is that most weight ratings are based on a single person in the vehicle weighing 150# - once you add in a few people you can find yourself well beyond the limits. While you might tow just fine, if you get into a dangerous situation you can find your ill equipped to get out of it, and you're putting a lot of extra stress & strain on your truck.