Curious about using the door sticker with Class Cs. I don't know how it works with newer Cs, but our 1991 is an RV built on what Ford called an "incomplete truck". ( It could have been made into an ambulance , eg)
The door info for weights on the 1991 incomplete truck is just for that, so it does not take into account the RV part added on after. There would be no way for them to know how much it weighs with the RV part on it. All they knew was how much the truck part can carry.
You have to weigh it with the empty RV part on it to see where to start from for adding more weight.
In our case, the empty RV part took up all the weight allowance for the truck part, so anything we add puts us over GVWR and RAWR. It has been on the road for 30 years well over the weight ratings so I am not too fussed about it (we got it three years ago) I have the back tires with more psi for the actual weight on them, and it has air bags, but that does not change the fact it is way over RAWR and GVWR. Luckily, "they" only make commercials pull into the scales!