I added the jaws of life to a few units like, the Heavy rescue, Large Ambulance, Hazmat and LEV. I do not know how to change vehicles @ stations, so I changed the staff of the hazmat to FF's and added Jaws of life and fire hose. I replace the hazmat staff when game starts. I did not change the files as you don't need to. I went to edit and click on the vehicles one at a time and went to edit straights and added the Jaws of life.