Whatcha need Kirmet? I'll help in any way I can.
I just built a Plug-N-Play setup for my wife's 2013 JSW this evening using parts, plugs, sockets, and tools I have been acquiring for a year now... I haven't tested it out yet, because it's raining, and I still have to flip a coin on whether I'm dragging a +12V wire all the way to the fuse box, or borrowing power from the 12V socket in the rear (again). However, I built the man-in-the-middle wiring sitting at my dining room table.
When I did the 2006 Jetta (sedan) in my avatar, I used a Plug-N-Play setup but borrowed power from the 12V outlet in the trunk. I always kicked myself that the outlet wasn't powered when the car wasn't running. If you're disabled at night or during the day on the side of the road pulling a trailer, you'd probably like to have some lights on the back of the rig... So, I'm probably dragging a wire to the fuse box on this one.
Key things to know: The JSW uses a 3-wire setup (Brake is separate from amber turn signals). Whatever
Powered tail light converter you choose needs to handle 3-wire vehicles. I went with the Tekonsha ZCI 3-wire (119250). I got mine off eBay before prices went through the roof (they're now over $130). I figured if the Amazon reviews said they would work on a Tesla, it would probably work on a VW. My man-in-the-middle harness, just gives me space to connect the current taps without having to strip back the fabric tape wrap on the factory wiring. It also gave me 16AWG insulation, rather than the incredibly slender insulated wires VW used.
The functions in the JSW tail light wiring plugs appeared to be (as numbered on the VW connector, and top to bottom):
1=Tail Lights
2=Brake Lights
3=Ground
4=Turn Signal
5=Reverse Light
If you're wiring up something for your 2002, I can probably help as well as I also have a MkIV wagon I've rigged for trailer lights and to drag as a TOAD behind our RV. (yes, that took some creative custom wiring, but it's still all no-splice, & no scotch-lock).
The issue I see with the TowReady 118572 previously mentioned in this thread) is that the plugs look similar, but there are only 4 conductors in each plug, not 5 like the JSW uses. The red wire in the 118572 appears to be the typical 3rd wire sense wire for the brake signal, but I haven't tested one, and I know VW has been using PWM to drive a variety of functions down minimal wiring since the MkV. I haven't dissected one or tried adding the extra wire and the right connectors. At $75, it would be cheaper to get any 3-wire converter that says it will handle PWM, and just add the man in the middle wiring with the right number of conductors. I'm not even sure the JSW uses PWM.