My DD is a 96 2wd tacoma (5lug).
Advantages:
Gets 2x the gas mileage my 4x4 does.
All expo gear stays in the 4x4, all my work tools live in the Tacoma (no having to swap to use my 4x4), it is always ready to go.
Long wearing, much, much cheaper tires then the 4x4
Rides and drives a lot nicer then the 4x4
Fits nicely in urban environments *also fits in parking garages
Attracts less attention from "the man" then the 4x4
Portrays a clean, professional image to my clients (no muddy 4x4 in their driveway)
Easy to calculate mileage for tax purposes (I only drive the truck when working, stays parked after hours and on weekends).
Can take my 4x4 off the road for weeks/months if needed for repairs and mods.
If I break it, I only have to worry about getting it home, not how I am going to get to work on monday
Conversely, if the tacoma needs repairs, I can work out of the 4x4 if I have to.
I have run 2 trucks for the last 10 years, worth every penny to me.