Ok, the place to tap in to the wiring is in the pass. side, rear seat foot well. Pull the carpet up and you will see a frame to body electrical connector. Use the diagram to match the wiring or use a test light and pin it out. That is the easiest place to get to them.
A six way flat is entirely possible. You should check out a marine supply store for that one. Your standard RV has a 7 way that covers lights, brakes and 12V charging. You don't have the 12V charging for a boat trailer. If it were me, I would wire it for the 7 way and buy/make an adapter to go to the 6 way. If you EVER tow anything else, like a tent trailer with 12V, you will have to wire up the 7 way anyways, so it's easier to start with the most and adapt down. We have a connector at work ( I couldn't find a pic)that has a 7 and flat 4 side-by side. You plug it in to your existing flat 4 connector and wire up the other 3. I will be putting one on my Gen 1 shortly. I will try and get a pic tomorrow.
My center mount hitch is rated at 3500 lbs and a 300 lb tongue weight. IIRC, the Gen 1 is rated at 4000lbs. I have been unable to find a 2x2 reciever style frame hitch. I haven't looked real hard, but I do work in an RV parts dept.
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