This thread is a few months old but I thought I would reply anyway. I bought a new 2022 2500 short-bed crew cab w/diesel and received it December 2021. I wanted an extended fuel tank so installed a Titan 52 gallon in January of 2022.
I bought the new Titan tank from Amazon (secondary seller)—> Titan Fuel Tanks 7030113 2013-2020 DODGE/RAM 2500 and 3500 52 Gallon extra heavy duty cross-linked polyethylene fuel tank XXL Mid-Ship Fuel Tank 4 Wheel Drive Only
https://a.co/d/7ktJs3S
I had a local truck outfitter install the tank. He quoted and ultimately charged me about $500 but complained he should have charged me a bit more. So the tank and installation cost me about $1900 (Jan 2022).
The 52 gallon tank is a mid-ship belly tank and replaced the OEM 31 gallon tank. I kept the OEM tank and have it drained, cleaned, sealed and stored in case I ever need to reinstall it.
The new tank is very large and the center hangs down about 2-1/2” (or so) lower than the OEM tank. The new tank crowds the fuel filter that is mounted close by, but the filter can be changed. I wouldn’t feel good about doing any heavy-duty stump-jumping off-roading with this tank without a guard plate protecting it. (Not sure if one is even available.)
I mainly use my truck to pull a covered trailer long distance (highway driving) and wanted enough fuel to travel between hotel stops without needing to buy fuel... 425-500 miles. This 52 gallon tank has worked out great. I contemplated an auxiliary bed tank but didn’t want to loose the bed space. It’s too bad Ram only offers a 52 gallon tank in their long bed truck. If/when I ever buy another truck, I would install another 52 gallon tank, for sure.