[sanddrag]

Have you considered purchasing team vehicles? If you go about it right, a suitable vehicle can be had for relatively little cost. (~$3000). It may not hold all your people, but something like a Chevy Suburban or a van would solve some of your needs. The issue with that is with who owns it, insures it, and pays registration on it. But if you can solve that, then you always have a vehicle dedicated to your team.

It's for purposes like this that it really pays to have a legal entity that is separate from the school, but there's also ways to work with school districts on issues like this. You just have to be nice to the right people.