I pushed for that slide weight before we purchased. There is no definitive answer. They have changed slide vendors, there are different size slides and the furnishings make a difference in weight. All that said, I was given a really ballpark answer of about 1,000 pounds going from the 2552 to the 2910D or 3100. Again, different size coach, slides, different furnishings, and so on. After calculating water (we always carry some), gas, propane, food, clothing, tools, office equipment (since we were working half time from the rig in the beginning), people and so on... we bought the 2552. This won't be the right choice for everyone. We are full time when we are on the road and payload was far more important than space. With just the two of us, we're good. It gets crowded when we go up to three or four but we manage. The whole world is right outside our door.
We have never had our rig weighed.