The problem is that many people want to join and it cost hatzala alot of money for the gear the member’s get. There is also lots and lots of politics.
The problem with a new volunteer ambulance, it seems to me that they started it more to show Hatzalah they could do it than out of a need to help others. I say that because Hatzlah is doing the job very well. Another ambulance staffed by guys who couldn’t get in to Hatzala isn’t needed. ALL of these organization have more politics than you would believe! The expression used is “Hatzahlah works DESPITE itself”.
You want to help? Volenteer for Project Yes or Camp Simcha or Tomchei Shabbos. Somewhere where they are looking for people and would want you.