This is an interesting question. There are a lot of variables to consider. We have discussed this over the years with different friends and it seems like everyone has a different opinion. For instance, is your dinette located in your 12 foot slide? And, is there storage inside the motorhome under the dinette? Canned goods have a way of adding weight without being considered. And...with 4 adults sitting at the dinette when the slide is extended.......well, you see what I mean? Our 2002 Bounder 12 foot slide has 3 compartment doors underneath outside and we were told that 100 lbs. per door was a good rule of thumb. There are also overhead storage cupboards inside the motorhome over the dinette and the couch that will add weight to the slide-out as well. As I said, a lot of variables to consider, maybe someone else out there has an opinion? I would bet there are as many opinions about this as there are different makes and models of motorhomes.