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Yeah, if you're constantly having to get in and out of your back, then I can see the "truck wings" being a huge pain in the ass. - unless you could rig it in such a way they don't interfere with getting into the back. But I suspect just having to walk around the extended length of the wing would would get real "old" real fast. I know from being on the survey crew that having something interfere with getting into a compartment on the truck is a major hassle.
It sounds like you do a LOT of stop & go with your deliveries. In that case, efficient acceleration/deceleration will probably be as big an issue as aerodynamics. For that, lower weight is key, but then, if the nature of your work involves hauling weight . . . ? So - hmmm... Tough question.
Try to learn the most efficient way to accelerate, I guess. I instinctively try to accelerate SLOWWWWW, but I guess that's wrong. I guess it's better to accelerate faster, keeping the engine at it's most efficient workload (BSFC - or Brake Specific Fuel Consumption) while going through the gears quickly so you're in top gear sooner.
Then the other side of that equation is learning how to decelerate efficiently. In that case, coasting is key (even closed throttle "coasting" in gear). Figure your roadspeed was hard won at the sacrafice of burning gas. Whenever you use your brakes, you're throwing away that gas. So try to "anticipate" your stops so most of the speed is lost from coasting drag rather than braking. Sometimes when going down a street in town, I'll take off from a light, accelerate, then look ahead and see the next light turning yellow, and then immediately go into coasting mode - almost from the last light & even before getting all the way up to the speed limit. If I STILL need to brake, it makes me mad at myself, because I should have looked forward sooner & stopped accelerating sooner. But anyway, constantly practicing these types of things can help a lot.
For aero, a grille block is probably the easiest & cheapest way to get the biggest effect (other than pumping up your tires as high as you dare). An air dam that hangs down as far as the other stuff hanging down is probably a good bet, too. Some sort of boattail/Kamm-back yields big gains, but is a challenge to make, and in your case, probably more trouble than it's worth. You could try slapping some rear fender skirts on. Some people see good sized gains from those, but when I tried it on my Jimmy, I didn't see any improvement at all, even in 3 different tests. That was a dissappointment.
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