I agree there is just too much variation in the weight of stuff (is the frying pan thin steel, or cast iron, ...), the better option would probably be to gather examples of all the things you think you would want in the RV and weigh them, then total it up. I think you will be surprised how quickly that hits 1,000 pounds.
If you don't want to weigh everything, you might look up the items you are considering on Amazon and look at the shipping weight for each, this will of course include packaging weight, but on heavier items it should be at least close. The shipping weight dependency can also allow for those things you forget to put on the list (weight of food items, toilet paper, ...)
Since BBQ grills were mentioned lets use the Weber Q1200 grill at 29.2 pounds as an example https://smile.amazon.com/Weber-51010001-Q1200-Liquid-Propane/dp/B00RFXS1Z6 since in online surveys on rv message boards they seem to be the number one pick by far. Then of course you will likely need the optional stand at 13.2 pounds https://smile.amazon.com/Weber-6557-Portable-Cart-Grilling/dp/B00FLRB0GK
By the time you add in an extend a stay propane connector to tap into your onboard tanks, a longer propane hose, BBQ utensils, etc. you are probably somewhere over 50 pounds just on outdoor cooking equipment.
folding bag style camping chairs weigh 6-12 pounds each (some better over sized ones weigh in over 15 pounds), a folding camping table is another 20 pounds or so, ....
All total you are looking at least 100-150 pounds of stuff that a typical person takes along just to sit outside their RV, this is before you consider those cute items like camp site flags, or flamingo lights.