Original sentence: Note that Type I's and Type III's are often called boxes by their crews with Type II's being called vanbulances; ambulances are also referred to as buses (which some EMTs and paramedics consider to be derogatory), mods or modulars (if type I or III), rigs etc
Edited sentence: Note that Type I's and Type III's are often called boxes by their crews with Type II's being called vanbulances; ambulances are also referred to as buses, which is not a very well liked term among paramedics, (as it denotes a negative slurr), mods or modulars (if type I or III), rigs etc