Hi, i am in a similar position (except it's a sporting club, not a motoring club)
we started off with just two of us and not even a bank account, however, we now have officers/committee members, simply because it shares the hard work around. Nobody can accuse me of using their money for nefarious purposes, because we have a treasurer who takes care of the money, deals with the inevitable bills (eg insurance, rent etc) and provides a report. I am very thankful i don't have to do it. Although we have a committee, i am still chairman meaning i get to set the direction, and veto things but also means i get other people's ideas (and again, hard work)
We have a constitution so that there is no doubt about how people are expected to behave. We also had to get a risk assessment and H+S policy because somone broke their leg accidentally and was considering suing us