Called for a brush fire but got upgraded to a structure fire due to the rapid spread of the fire to an abandoned mobile home. On arrival of Car 1620, found mobile home was fully involved and NJ Forest Fire Service already on location. Tanker 16-5 extended two 1-3/4" lines to the fire and helped out Forest Fire with support, while Nesco's Tanker 16-15 helped to supply water to Tanker 16-5.