I'm not sure how our frames compare, but I installed the Draw Tite 82201 on my 3160RL. Also installed the same hitch on my last 5th wheel; it is adjustable for different frame widths. My frame is the max width for the hitch (actually about 1/2" too wide, but I made it work). I bolted the Draw Tite to the outside flange of the frame.
3000# is a lot of weight; you will have to decide about that. I used to tow a jeep behind my smaller 5th wheel, but I won't do it anymore. I decided that was too much weight, even though the jeep has very little tongue weight (tows on all four wheels). I don't put much more than a bike rack back there now.
Draw Tite hitch on e-trailer:
https://www.etrailer.com/RV-and-Camp...ite/82201.html
Hitch extension:
https://www.amazon.com/gp/product/B0...e?ie=UTF8&th=1
Anti rattle clamp if you need it:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
1st photo: old hitch removed, frame prepped for new hitch. You can see that, on my rig, the water tank is not a factor.
2nd photo: new hitch installed
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Scott & Alta
2017 Montana 3160RL, Legacy, Onan 5.5Kw, Solar
2022 F-450 Lariat Ultimate