The only time I hated working out of a pick up was when it was raining. The van offers shelter while your in there getting stock of putting it away. I think a canteen truck with the 3 doors that flip up and offer some coverage from the rain would make a great sparky truck.
The wall that separates the driver from the rear of my van has a door in it. Can access the back of the van without getting rained or snowed on http://www.adriansteel.com/vbaseplus.htm
How long do you keep your trucks ? Take it from a long time Chevey driver about 85,000 miles the in tank fuel pump is going to be replaced and in a pickup the best way to change a fuel pump is to slide the bed back.My 96 had 3 replacement fuel pumps.The factory pump lasted 87,000 and the other 3 were put on between 87,000 and 109,000.Knowing that and after spending hours unloading the pickup I would think looooooooong and haaaaaaaard about working out of a pickup/toper setup