Ill share my two cents and hope someone learns from my experience.. I was in the same position as you are just two years ago, factory airbags or not, dual alternators, debating between mega or cc, SO vs HO, 3.73 vs 4.10 gears, (DRW was definitely not an option), and short bed campers seemed to be the fit for me. Well, after a lot of research I ordered a mega cab SRW (the one seen on my profile picture) 6.7 SO, 3.73 gears, with dual alternators and factory airbags among other options giving me a payload sticker of 3880lbs. I bought a camper that was pretty close to the limit at 3300 dry, but once I was wet and loaded, my camper ALONE was just shy of 4200lbs. I also tow a boat behind it at times (400+- tongue weight), so you can imagine I pushed the payload pretty good when I would tow. Part of my poor reasoning with accepting pushing the payload is that I come from a Ram 1500 with full air suspensions and boy I maxed the payload on the truck multiple times (almost three times the payload on occasions) and the truck handled without a hiccup, I was just amazed how the truck handled with the air suspension. That was clearly a total different application, and systems (not mentioning payload sticker for that truck was 900lbs) which does not apply in any way to the air suspension on the HDs. Just sharing what led me to poor decisions haha.
Back on the topic, I knew my weakest link on that truck (2020 3500 SRW) were the tires, so I upgraded to a larger tires giving me over 8k lbs per axle capacity. The truck handled well in most circumstances and power was not never an issue even with the 68RFE and 3.73 axles, but the automatic rear suspension would throw codes at me when fully loaded or going up steep hills. Not fault of ram at all, but mine for pushing the payload limit. The truck would sway quite a bit and there were not swaybars for factory air equipped trucks at that time. I felt comfortable with the truck for the most part, but knowing I was pushing it so much made me feel uncomfortable plus seeing lights on my dash bothered me even more. A good friend of mine was looking to buy a new truck, so I mentioned my dilemma and ended up selling the truck to him (only 3000 miles on it btw).
I ordered a 2020 3500 Mega Cab DRW (did I write DRW was not an option before? haha), 6.7 HO, 4.10 gears, dual alternators, WITHOUT airbags (same color and other options as the other one) with a payload sticker of 5350lbs. I installed a hellwig sway bar, and added automatic remote controlled airbags. I actually like the aftermarket airbags better than factory, you know exactly the pressure on them and can adjust as you please, and much cheaper than factory installed option btw. Truck handles much better, there is power for days, bunch of positives for my application and what not, but here is the moral of my story: I did not want a DRW because of the way it looks, how big it is, blah blah, and I DID NOT THINK I was going to push the payload. I was wrong. Ive seen northern lites, and researched almost every brand of camper before buying mine (eagle cap 811) so I know their stamped weight is often different than real life, plus water, and options. There is a good website for only truck campers that allows you too match your truck and camper, and has bunch of information regarding truck campers (I'm not associated with them in any way), just google truck camper magazine and browse around... I hope this helps..
Oh, dual alternators would not let you use your microwave or other AC outlets on your camper. You need an generator, be plugged in, or get an inverter for the camper.
Regarding the bed liner, you're going to need a bed rubber mat (whether you have a bed liner or not) to protect the camper and preventing movement.
Theres a bunch of stuff on that website I mentioned, but I'm here to help. I started from ground zero with absolutely no knowledge regarding campers and I'm getting more comfortable as I go/learn. Have fun shopping and you're going to have a blast with the camper.
Here is a pic of my dually.... I just ordered 19.5 Alcoa wheels and Michelin tires, not for payload but for looks now lol (although payload will be almost 10k at steer axle, and almost 20k at drive axle, Ill never need that I know)....
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Here is my old SRW...
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Hope this helps...