I was able to ride the Trek Transport on the Cycle Memphis ride (mainly because the person I always asked to ride it never could. Doug.) last Saturday night.
Normally when I SAG that ride I bring my BOB Trailer and pack it with about 12 spare tubes of differing sizes, a basic tool kit, pedal wrench, lock and a floor pump. At the midway point a few tallboys are added to the list.
The bag that comes with the Transport was able to carry all of that and still had room (for more beer). It is essential, I learned, to remove the bag while the bike is parked. The unbalanced weight will tip the bike.
The long wheelbase of longtail bicycles makes the ride very smooth but the fold-out platforms on the Transport rattle considerably. You get the feel of a Cadillac with the quietness of a tractor. If the rattle-factor were remedied this would be a remarkable around town cargo bike. This has a more stable ride than hooking a trailer up to a road bike.
However, I would also need to rearrange my house to be able to store it.