Welcome to the forums and congrats on your truck!
As mentioned multiple times on this forum, even though you put in your VIN, that doesn't mean that the rating is exact for YOUR truck. The VIN number tells them nothing about options, and if you didn't enter in all your option codes, (because there isn't a place to) they have no way of knowing what's on or in your truck. The numbers listed are the maximum for what the VIN does tell them, which is only your trucks build configuration (i.e. crew cab, 4x4, Hemi, 3.92, etc). You need to look at your door jamb loading sticker for your exact vehicle payload, and then compare it with the maximum. Take the difference and subtract it from the towing number and then you'll have your exact trucks capabilities.
Here's an example. Let's say your door jamb sticker says 1,450 lbs for payload. That's your payload, period. Ignore everything else.
Now take 1,840-1,450, which equals 390 lbs. That's the weight of the options on your truck. I wouldn't be surprised if your Rebel is close to that number.
Take 11,340 and subtract 390, and that's your towing capacity: 10,950 lbs