This thread, while a bit outdated, is still highly relevant and frequently asked by our clients. Granted, this year the pandemic has made this a non-issue, but this has been and will likely once again be extremely important to Tuck.
You should do whatever you can to initiate and schedule an interview. The school recognizes that while they are in a more remote, less convenient location, it is still a reasonable ask if you really want to go there. They offer many dates and times to pick from so you can plan these things in advance to help cut down on costs and/or manage work schedules.
Tuck, given its class size and location, is very big on students who demonstrate a genuine interest in being there. It is integral to the Tuck experience. If you are already showing signs of hesitation to make a single trip there - for whatever the reason - it may cast doubt as to whether you would accept the seat in their MBA class. There are very few excuses that they will see as convincing, particularly the two you mentioned: cost and vacation time. Sorry to be so blunt, but it's a competitive process!
-The
Admissionado Team
https://admissionado.com/