I had the first FRS-H in the Army when I was in.. Worked great..
Whatever your item may be, you DONT want to have to do maintaince on it on the side of the MSR.. Thats just inviting indirect fire via mortars or directfire type of threats.. Not to mention the VBIED... Make sure you have provisions to towbar or tow it off to the FOB where repairs can be completed...
As for flats on the move, a "flat tire battle drill" is mandatory.. A humvee can have a pit stop style tire change with a Robo Impact, a "real" jack (not the humvee BII one)and a few trained soldiers in litterally a few minutes.. Larger trucks require a few more minutes, bigger tools, and the like, but training is the KEY thing.. The "the longer we stay here messing with this thing the more likely the bad guys will start shooting at us" is a GREAT motivator to get the job done quickly. Best case is EVERY vehicle has a robo impact or similar, but atleast 1 per 3 vehicles is not bad. Also, making sure all your lugs are "field breakable" with the tools you have is a good thing.. If the motorpool guys use a 1 inch air impact to put a tire on with, make sure your BII/OVM tools you carry on convoy can break the lugs. If not, you got problems.
PM me if you need more info or have OPSEC issues..