I think we are talking the same thing on the upfitter switches. I have them now. They are mounted low on the dashboard. For maybe $200, if I don't ever use them, it's no big deal.
The diesel and transmission....without going back to the Ram site, from memory, if I go Cummins+Aisin I get maybe 130 more ft. lbs. of torque (930 ft. lbs.?) and maybe 50 more HP than the Ram automatic. It's expensive at about $2800. I haven't seen any different HP/torque values listed for different rear end ratios.
The alternators...Think I'll go with just 1 but higher output.
Rear axle...the 3.42 has served me well, but maybe leaning to 3.73. Mostly to maybe avoid locking out 6th gear.
The weight...I told my previous owner that I wouldn't buy it until we ran it over a CAT scale. I could tell he wasn't very receptive to that. He just pointed out what Bigfoot said on the rear label and the paper label in the wardrobe. I think the rear tag said 2820# and the paper label maybe 3280#. It took forever to load it on my truck...very unlevel pad and he had never loaded it before! A storm was brewing, and too much help from the neighbor. Anyway...I didn't weigh it until after I paid for it. With full fresh water, 2 changes of clothes, minimal food, a very few tools, it came to 3880#. My payload is 4018#. I've used it loaded very light for a couple fishing trips. This last trip was packed for 6-10 days, heavy clothes, lots of food, etc. I was over RAWR, payload, and right at the tires limits. So it gets down to...do I want to keep this thing or get rid of it? Keep it. Bite the bullet and go get a bigger truck.
2018 Ram 3500 CC LB DRW 4X4 Cummins Aisin Laramie Pearl White
2018 Landmark Oshkosh
2008 Bigfoot 25C9.4
2014 NauticStar 21 ShallowBay 150HP Yamaha
2016 GoDevil 18X44 35HP Surface Drive