We go through a lot of towels so if we don't see a towel cart in the hallway when we first go to our room, the first thing I do is call housekeeping to request 6 extra towels and one extra set of sheets and blankets (for an air mattress) and they're usually delivered within a few minutes. Then I "hide" the extra towels in a drawer so that when housekeeping comes in the room they continue to refresh as normal but we still always have extra towels. Honestly, we rarely saw the carts in the hallways at AoA LK or Nemo pre-covid unless housekeeping was working on rooms. We always saw them by the pool but didn't usually want to make a special trip there to get towels -- especially since we needed other stuff from housekeeping anyway. When the kids go swimming, they grab a few extra towels off that cart. Not sure if they have more towel carts around the buildings now that housekeeping isn't cleaning the rooms every day, but calling housekeeping for more towels isn't a problem -- especially now that the DCP kids are back and I've seen a lot of them mention they are "runners" for housekeeping at various resorts.