There are some practical reasons to own a black truck. I wasn't originally keen on black but I bought a new black 95 because it was mechanically what I wanted.
Pros:
1. Black, white and red have the highest resale values (Consumer Reports and other magazines. ) They are 'traditional' colors that don't go out of style like other colors. (... . like lime green Dodge Chargers if you are as old as I am. )
2. Easier to touch up. As one very experienced body shop owner told me, "black is black. There are thousands of shades of white. . ' . . and other colors I would add. My wife has a white Ram that is only a few years old and it is impossible to match the paint now that it has faded a little.
I had some rust spots in the bed of my balck 95 and using the black POR-15 rust converter the bed looks brand new and defies all but a very close inspection. The black to black match of the stock paint is perfect.
3. As far as dirt goes, I wash my truck weekly and it looks great for a week.
4. As far as paint hold-up my black truck cleaned and waxed looks new. As I said, mine is a 95 and when I took it in 1. 5 years ago for an annual inspection the service writer first wrote it down as a 2001 model. When I told him it was a 95 he called into the shop to his buddies to come out and look at the truck. Of course, I do take care of the finish. I hope the black on my 2004. 5 holds up as well.
Cons:
1. If you live somewhere HOT (and I mean HOT) you will have an issue. I had a black Crown Victoria police cruiser on a job at the Rocky Flats nuclear weapons plant in Colorado. I came out one summer day and the rear-view mirror was lying on the front seat. The glue had melted. I would put a towel on the seat so I wouldn't get a permanent vinyl imprint. Eventually the glue holding the headliner on began to melt. The next time I turned the car in at the motor pool I took out a light gray cruiser and the effect was much diminished.
I agree with DPKetchum that continually high heat would affect components. Also, I never leave a firearm in a car but for those who do you may have a suprise in store for you if you pull the trigger on high-pressure ammo that has been sitting at 150 degrees all day. Can you say "proof-load?"
I live in Maine now. Heat, even in the summer is not an issue here. If I re-retire to the desert southwest I will trade for a white truck, not bloody likely.
Most Important:
Life is short. Get the color that gives you pleasure every time your eye lands upon it.