Our first serious tandem was a second hand, hardly used T-2000.
It was the bike that really got us hooked on tandem riding. We rode it about 2-1/2 years, usually 40- 62 miles every Sat./ Sun. We sold it when we had a new coupled custom bike built.
We only had to change out both seats and stems to get a reasonably good fit on the Trek. If you're looking at buying one new from a dealer, they should be able to tell you if they can get it sized to fit close enough from the start.
If they don't do a comprehensive measurement and fit, keep shopping.
If they can put you on a T-2000 that they'll guarantee fits both of you, it's a great bike for the bucks.