Generally even boats don't have an algae problem unless they sit a lot, and keep the same fuel in the tank for long periods. Some large slow-speed cruisers refuel as little as once a year - they and those that just sit at the dock are the ones that need to worry about this.
My boat sits all winter on its trailer, but never has a problem. When I'm out cruising I refuel at least every week or so. If you use your truck often I can't imagine that you need algicide.