There is no central location or "spreadsheet" with all this information, because it is CONSTANTLY changing! Manufacturers bring out new models, discontinue old models, update/change existing models... Not a trivial thing to maintain, nobody is going to do it for free... Then who is going to PAY for someone to gather and maintain the data? Certainly not the camper manufacturers. They don't want you to know other brands exist, let alone acknowledge that their product might be inferior to others.
You will need to do your own research. If out of the kindness of your heart you decided to compile and publish this information, I'm sure people would appreciate it, until it becomes outdated in 3 months.
What do you plan to do about the WET weight? After you add 750lbs of water, propane, food, drink, clothing, equipment to the camper...
