Our club insist that every pilot has a Co2 extinguisher for dealing with start up issues, but we provide a few club ones too. However we have invested in a number of foam Ones and these perform really wel on fuel fire following a crash.. C02 doesn't really hack it with a fuel fire and if there is a breeze they are hopeless.
Foam is a good investment for a club, and have them sat in a car wit the keys in the ignituion ready to go at a moments notice.
John