Making a statement that one can buy a truck with the PW package and then upgrade the vehicle to increase the payload really, at best, begs the question of why someone would buy a power wagon package only to remove just about everything (but the winch and some graphics) that makes it a power wagon. At worst, someone thinks all they have to do is put new shocks on it and, voila, it has tons of capacity. The sum of its parts designs it for a purpose not commensurate with heaving towing.
It isn't just about the numbers printed on the door, it is heading off into the unknown with more mass than originally intended and then moment arrives where an unexpected event occurs because some part, either original or non-specified replacement part fails due to the mismatched combination. The hope is that this event only impacts the driver, but sometimes it ends up impacting others and all arises from a "hey y'all, watch this" moment where someone knows they put the right parts on and the numbers are just made up.
And using the truck not as designed voids the whole warranty and any extended warranty, plus adds potential liability problems elsewhere. Losing warranty on the aftermarket parts pales in comparison. Read Ram's warranty policy, specifically why it will void a warranty.
If one wants to tow large, one buys the right truck and tows their fun-vee to the trail.