Ideally, the extension would state how many seats are available in total, count down as someone commits, sorts by a departure/destination point and date/time, and enables those who will be travelling together to share information securely - or at least privately - in other words, no emails displayed in the component itself to avoid spam.
I know of nothing ready made for you.
Users should be able to publish their own trips, based on Joomla permissioning just as with weblinks or content items so that the site administrator does not have to 'set up' each person who has the ride to offer.
I suspect that a "classified ads" extension,
could be made to work, but be prepared to do two things:
1. Alter the appearance and language of the extension to suit your tastes, and
2. Address some fundamental workings in the extension to adapt to your needs.
It MAY also be useful to install Community Builder or one of its competitors to have use of the "user profile" feature to make this all work smoother.Added at last Minute:
It also occurs to me that SOBI2, having a marvelous interface permitting unlimited custom fields and assigning "ownership" of listings, could be made to work for you.
I hope this helps!
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