More on the sink laundry, on a big ride where things may get crowded, you might not have much space to hang your wet gear. Be ready to do things in a compact fashion.
I have a kickstand on some of my bikes, used an elastic to lock the rear brake at the handlebar so the bike won't roll in the above photo.
On a different tour where I was part of a group of a dozen with ACA, I made the mistake of stringing my clothesline before I washed my clothing. When I returned to hang it, everyone else in the group had already used my entire clothes line. Photo below.
Lesson learned, do not put up your clothesline until you are ready to hang clothes on it.