So I've only included this review to show others. I read a ton of reviews but still got it wrong and misunderstood. Well, in the end I can still say that I made it myself. :-) To get the tandem version I had to order QO1515 which is the model number without the T. Now that I know which one to choose I decided it was too expensive for my blood so I just got the QO15 , the single, got. Of course one day I will pay more if I run out of seats and need to buy a tandem, but I still have a few seats left. :-)
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