It must be remembered that alongside the forces on emergency tours, there were still the permanent units of all three arms doing normal postings and carrying out the mundane work in the background. I was posted to Lisburn, REME attached to 18/26 Sqn RCT, the day after Op Motorman and a year later was sent to their D Troop in Ballykelly, where I spent another year. Most of what the unit did was standard transport work, but there were also some sneaky beaky vehicles. Most of the obvious military vehicles, such as Landrovers and Bedford RLs were in DBG if I remember correctly, but everything else was in civilian colours.
We had coaches for the airport run, mobile libraries, chip vans, removals pantechnicons and all manner of cars and vans for general work. Of course, this meant drivers and crews going to every part of the province and being as much at risk as those on emergency tours, and several were killed. I hope their stories will be included in what you are working on.