I'm new here so bare with me, and I'm old (really old) which only adds to the problem
I thought this might help someone in an emergency: For the TTTP (Don't know about the rest)
If you find yourself in a situation where you need to adjust/fix or replace your chain while out on a ride and have nowhere to prop up the back wheel so it spins freely. Here is a quick fix/hack for you:
Loosen the stokers handlebars and turn them down under the bike, now tighten them up, your back wheel should be (if you're tires are at the recommended 100 psi) about 1/2 inch off the ground and able to spin freely for any adjustments.
NOTE: I use this method to quickly clean and oil my chain when I get home.(every other ride or so depending on the mileage on each given ride) If you have to drop the wheel completely (because of say a flat) then you will need to put the stoker on all fours and place the handle bars on her back. (This last part may be a bit of a problem depending on how open minded your stoker happens to be at the time and how badly she wants to get home.
But as a rule of thumb:)
Lifetime stokers are a little more likely to get their back up (pun intended) than those pretty little things that are just out for a fun ride
Again: I'm 67 years old, so what the hell do I know:)
Rubber Down, Heads Up!
Oh, and, You will scratch the shiny little parts on the top of the stokers handle bars, if this is a problem with you or your stoker when you are stuck out in the middle of nowhere..... we'll ..... then, don't do it Billy-Bob, Up To You!
(you could put your gloves over them, but, I like my gloves:)
As for me:
I live on the west coast and if you've ever watched the sun go down, the last half moves pretty damn quick! (as does life!!)
I'm going to ride into the sunset and see if I can slow it down just a bit!!
You want to sit there and just watch it go down, again, up to you!