Ok, I was about to start on dry weights, but I see that you're referring to the yellow sticker. It is way more appropriate than the advertised "dry weight" (which looks to be 962 pounds
It looks like 80 pounds are accounted for. Seems a little light if they're accounting for full propane tanks and a battery. You might be even less than 880 if they aren't fully accounted for.
Otherwise, if you're going to put slide toppers on- that's another bit of weight that you lose.
So, figuring- lowball, 700 pounds left for "stuff". I'd guess it could be done, if you're careful. (If you buy it, I'd try to get a couple of weighings in after getting it to ensure that you're within the camper's GVWR.)
I'd definitely plan on carrying as little water (fresh, gray and black) as possible. Water is heavy at 8 pounds per gallon.
Then you're just looking at your personal items and what you carry with you (keeping in mind that it can add up- food, drinks, clothing, toiletries, cooking instruments (pots, pans, grill/tripod for fire, utensils), towels/wash clothes for showers, tools, chairs, outdoor tables, etc.).
Hopefully someone with a 2608WS will chime in...