Currently, there are about sixty-five units of 4x4 vehicles. Considering the high volume of people visiting Mt. Pinatubo every day (especially on weekends), making a reservation is highly suggested to avoid any inconvenience on the day of the tour*.
TRIPinas provides this service to all of its clients so they need not worry about not having a vehicle on-site.
*Several untoward incidents in the past involving private 4x4 vehicles have led the local tourism office and PAF to ban them from crossing the Crow Valley to avoid similar accidents from happening again.