Cabover and Towing questions

Ok, so I have to ask here because I want to try to stay logical and no overdo anything if not needed. But in stock form, unloaded, how much weight do you think rides over the rear axle? Excluding the axle, you have the leaf springs, the fuel tank, the obvious long bed, spare and the back half of the frame.

After doing some research i'm looking at 150lb wheel/tire combo and a hefty $2500-3000 upgrade. So I would have to seriously look at weights of the cabover. Even though I don't want to compromise safety, I don't want to go overboard with ridiculous $$$$$ upgrades.

Honestly, I was thinking of airbags, the strongest load range E tires, the superhitch along with a super truss extension along with the good mounts.

And, no, I will not be hauling the camper enough to warrant upgrading to a dually. No offense here guys and I respect everyone's replies but I have to piece this thing together logically. It's real easy to spend other people's money on internet forums. Unless someone here tells me i'm going to roll my vehicle or suffer a major blowout, i'm not spending $7000-10k to upgrade. If that were the case, I'd get a used class c diesel motorhome and call it done.

My advice is to look at the rear axle rating you have. Weigh the truck. And go from there. One ton duallys are more than just two more skins down. They also have a substantially bigger rear axle than a single rear wheel three quarter ton truck. Air bags, energy suspension bumpers, more springs, 19- inch tires/wheels won't increase the axle rating. Start there and decide what you can carry. My guess is that you will have about 2200-2300 total pounds of payload, for everything including people, stuff, dogs, bicycles, kayaks, camper, tongue weight, fuel, tools, truck options, etc. The Cummins is heavy and if a 4x4 truck even heavier. Good luck!