Well I officially hate UV mapping. The actually texturing isn't too bad, I've always liked reskinning vehicles.
http://www.emergency-planet.com/uploads/monthly_2019_12/1559060835_Em42019-12-3022-20-06-247.thumb.jpg.243796c03883cf51cfdf5eb951a9338f.jpg
Here's Medic 1, creds to Itchboy and Ghosty for the model/OG skin. I'm not sure how Santa Cruz AMR numbers their rigs besides they have about 6-8 rigs on duty per day, but I'm planning on the following:
Medic 1 - Transit
Medic 2 - Transit variant
Medic 3 - Transit variant #2
Medic 4 + 5 - new style E350
Backup Medic 6 - old style E350
Supervisor 1 - F150
Supervisor 2 - Expedition