Ram 2500 - which towing features are best/good/unnecessary?

Audiodane, first of all be looking at 3500's for extra payload. While a 2500 and a 3500 SRW have minimal differences on the outside, most of the time more towing features are available on a 3500.
To that point until 2019 the only gear ratio available on a ram 2500 was 3.42 and only 68RFE trans.

* 5th wheel prep package
This is worth looking for in a used truck, you can purchase the kit and install but well worth having there in the first place. LOVE not having rails for the 5er hitch!

* cargo bed camera
I don't see a need, there are other ways to line up with the pin.

* auto-level air suspension
This is the one option I wish the truck we bought had, the factory system is very nice. Best on the 3500.

* exhaust brake
This is standard equipment on Ram 2500 and 3500 since 2007.
I had to add one to my 2001 Ram, both work very well.

* bed length
I prefer long beds, many prefer short beds, just less worry about 5er to cab contact with a long bed.

* any others?
Spray in bed liner.
Running boards, preferably full length wheel to wheel.
Towing mirrors, preferably power and heated
Park Sense, warns when getting close to other cars, includes backup camera. I still don't use the camera much, but love the sensors.

* where to buy?
I used all them for the search, and bought from a dealer.

If looking at Rams use THIS VIN equipment listing by VIN, this will list the installed equipment and list the GVWR, Trans, and gear ratio.