Great writeup!
I was attempting to explain the combinations of weights to a new truck owner that just bought a 2500 Cummins because he wanted to tow a toy hauler. Running the numbers on his truck he would have had a better tow capacity with the 6.4 Hemi only due to tongue weight of the 5th wheel. He just kept saying "I got a diesel it can tow it" Yes diesels have stupid torque for the hills... I understand that... but they are a heavy iron beast!
His as configured had less payload than my 1500! (but he does have 1000lb more tow capacity... not much gained for over twice the $ and not useable as per calculations)
His: 2020 2500 Laramie Megacab, Cummins, 3.73 axle tow and fifth wheel package. (he said sticker said 1700lbs, wouldn't let me see it, but charts online are around the same)
Mine: 2020 1500 Bighorn Crew Cab 6'4" bed, 3.92 axle full tow package. (my sticker states 1748lbs)
Quickly running numbers, he had about 1700lbs payload (he wouldn't let me see his sticker), minus people and pets 700lbs (guessing and being modest, family of 4 and 2 Rottweilers), his fifth wheel hitch ~160lbs all in, his low profile tool box empty ~80lbs (im sure it was empty
). leaves what? 760lbs? his trailer was GVW 13800, 15% on the tongue fully loaded would be 2070lbs? If he had the Hemi, he starts around 2500lbs, giving him 800lbs extra payload??? for a total of ~1560lbs and a max trailer (in 5th wheel) of 10000 lbs, that difference in tongue weight equates to about 5500lbs of trailer!
My setup basically has the same payload as his (mine is 1748lbs) , Just a slightly lower GCVWR, We were looking at a "150 compatable 5th" that was 8600lbs fully loaded, TW of 1290, passenger weight 450lbs, ultralight 5th wheel hitch at 102lbs, and nothing in the bed. My truck still would have been 100lbs over. we decided on a 7594lb (fully loaded) bumper pull (lower profile, lower tongue weight, better mpg, no steps inside, and we went 5 ft shorter to keep same turn radius as the 5th had.) and our numbers were much better since we now dont have 102lbs of 5th wheel hitch, and a tongue weight of 760lbs. Our actual scale reading shows a payload total of 1296 in the truck when we intentionally fully loaded the trailer to actually check our weights. Ill have to say 1940lbs of stuff is a lot for camping
The just of the story was I wanted to try to help someone prevent a very costly potential mistake... but what do I know... I just ran numbers that "dont mean a thang, the ram commercial said..."