There should be a marked per vehicle weight limit, that is standard on Gondolas. Doesn’t mean it has to be followed, for example the gondola I was on this morning, which is a Doppelmayr with brand new cabins, has a 705 lb limit for 4 people. With ski equipment, an average 4 adults will be a couple hundred pounds over the limit but are still loaded, which is not unusual across different mountains. Now at Disney, the 180 pound average US weight would come without ski equipment adding weight. The simplest way for Disney to stay under the limit, which is likely to be 1800-2000 lbs for these cabins I would guess, would be to load fewer people than the max. And that really shouldn’t be much of an issue, since the system will move people quick enough to avoid a line buildup except potentially at park close.