Neat. The 3/4 ton capacity is certainly nice when hauling stuff; I know I really like my C30. Are you going to leave it a stepside or put a fleetside bed on it?
I'd say a good trailer brake controller is really nice; I have an old proportional Kelsey-Hayes hydraulically-controlled one in my truck. Of course, a good trailer hitch and a selection of hitches/balls is a given to go along with that.
I love my Jr West Coast mirrors with the extra clamp-on convex spot mirrors, too; I can quickly glance and see all my tires (not the fronts, obviously) when in tight spots or on narrow roads.
The mud tires on the back are sub-optimal in the rain, but they are also great to have if/when you need them.
It's also kind of nice to flip the cab marker lights on and let all the numbskulls know that a loaded truck 102" wide is coming at them when it's dark.
