Funny thing is: our trucks don't have Brush/Animal guards: and we have deer, elk, moose, antelope, horses (wild and tame) cows, bison, coyotes, eagles (Bald and Golden) and about every other animal you can think of.
Also we have 4WD ambulances and we use it. yesterday was 34 miles in bad mud with puddles up to 3' deep. fun trip.