I didn't have the patience to read the above. Here's the scoop if you want to stay DOT legal and do your own numbers.
RAM did use the SAE J2807 standard when calculating payload. (In your case I would guess you'll be fine but do your own math - Scales are always a good idea)
For trailers over 5000 pounds, RAM recommends a Weight Distribution hitch. (it is a waste and additional hitch weight for anything lighter than 5000 pounds ~65 pounds for the WDH)
Use the numbers on the inside of your door, scales and the SAE standard to calculate your payload and towing to remain DOT legal.
If you haven't changed tires/wheels/bumpers/etc. you'll have an absolute number
Now, that said:
I'm guessing you have the 5.7 Rebel 4x4 absolutely loaded with a sun roof since that is the only option I don't have and mine is right at #1113 or some other painful number.
From a stability and performance standpoint, I have the below that "may" be "slightly" above my max normal payload. Separately, I tow a GVRW #7700 travel trailer with a tongue weight of #830-#902 depending on what I have inside (and where) the trailer. The truck has been stable, driven and stopped well. No unusual wear on the tires or brakes and MPG has been an expected 7-9.
I'll let you do the math:
rough SAE numbers 300# passengers, and full fuel if I remember correctly.
I start out at -40# without my wife in the truck
wife weight almost non-existent but we'll add 150# on my number just in case.
120# dogs
85# front winch mount
240# rock sliders
80# bed rack
180# decked drawers
50# road gear
43# lights/compressor/etc.
205# RTT/awning (removed while using the trailer)
Hope this helps.