They work great for touring
My fiancee and I have a Co-Motion that we tour on:
One of our first rides was from Seattle to San Francisco, and we had a blast. A couple of recommendations if you're going to be touring and camping:
*A third brake is nice to have. I've got V-brakes on each wheel controlled by the left brake lever through a cable splitter. I've also got a disc brake on the back wheel controlled by the right brake lever. I'm not sure if you can still find drum brakes for using as a drag brake, but that's also an option if your rear hub is set up for it (it'll be threaded on the non-drive side). I doubt your frame is set up for disc brakes.
*Tires. Don't skimp here. The last thing you want to be worrying about ripping down a mountain is the condition of your tires. We put on a pair of Schwalbe Marathon Racer tires and have been extremely happy with them. They're a little heavier, but we have had absolutely zero tire problems other than a sliced open tread after running over some glass with the back wheel (I was able to get the front around it, but as you've probably learned, the back is the tough one to move sideways). We finished the tour (another 500 miles or so of riding) and then replaced it. We have yet to get a flat on the tandem.
* Stoker seatpost. Yes, call out any and every bump that you can. Putting a good quality suspension seatpost in back for the stoker is key. After our big trip we put on a Cane Creek Thudbuster seatpost, and my fiancee loves it. I still call out the bumps and whatnot, it just takes the edge off of the little stuff that wears you down over a long day. When your suspension seatpost wears out (and it will since it compresses down and forward when the rider's weight will be going down and back), go for the Cane Creek.
* Drop Bars. Ok, not really a needed thing, but as you've noticed, being captain is a work out. It's nice having a few different places to put your hands while riding. You'll probably have to lose the flex-stem if you go this route
* Saddle bags vs BOB. I have and use both. For touring on the road, tandem bike or single, I use saddle bags. It's easier to maneuver the bike around and it lets you take turns drafting when you come upon other riders touring. The trailer works just fine on the road, I just don't like how long it makes the bike. Drivers are pretty dumb and tend to forget things as soon as they lose sight of them, even if there's a safety flag flapping in the breeze.
* Cranks. Check your cranksets for cracks. I recall seeing a lot of that vintage crankset with cracks, especially Shimano and Specialized brands. They tend to crack at the base of the crank arm where the chainring spider meets it. If you'd like pictures of what I'm talking about, PM me and I'll go rustle some up.
I like the tandem for touring much more than being on two single bikes. It's easier to communicate with each other, it's easier to maneuver through traffic with the stoker signaling and keeping an eye on traffic. The stoker can also keep a close eye on the map and give directions, or pass up food, etc. As nice as that all is, just keep in mind, as captain you are very vulnerable to attack from an upset stoker, so it's crucial to keep them happy :bike_rider: And yes, it's true that wherever your relationship is going, a tandem will take it there twice as fast.