I just came to the realization that my 1985 Bombardier Iltis, with 75 horses (on a *very* good day, with the wind at my back, going downhill...) has a payload capacity (including passengers) of 500Kg. Let's hypothesize that I weigh 100Kg (hah) and my passenger weighs 100Kg, that leaves 300Kg. I'm bringing ~80-100L of fuel (let's say 100Kg). That leaves 200Kg of camping gear, food, water and beer. I guess that will have to do!
This was a surprise to me because my pickup truck has a virtually unlimited volume of camping cargo - there's no way I can surpass the weight it can haul - unless I packed up a lot of firewood to bring!
Still no regrets; the Iltis is a fantastic go-anywhere vehicle, and it will absolutely bring all my gear camping... I just need to be a little careful regarding weight :)