I had 3, but one broke, so am back to 2 and I keep forgetting to get a new one, or when I do remember, the trolley is full and I don't want to do the balancing act with it all lol.

I like to take the washing downstairs in one, clean clothes in another to go out to the line (when i use it) and then to bring up the dry ones, and the third was to dump the clean ones into for folding/ironing. I try to fold most of the clothes as they come off the line, then put them away when I get upstairs. If I fold later on, I usually have all the clothes sitting on the lounge and coffee table, so I have to put them away then.