One of our friends sent us these images of a Super Duty running around Michigan with a boat-load of test equipment inside and outside the bed of the pickup. Although it's a little difficult to see, the front end does have some cooling sensors and camo, and inside the bed of the pickup are quite a few large (we'll assume) data collection boxes.
Our guess is this is likely a setup from one of the many area CNG or LPG install companies that are collecting test information regarding a new powertrain modification for Ford's bigger pickups. Many of the larger commercial fleets (most of which are Fords) are looking for ways to make those vehicles more efficient. As a result, there has been more interest in retrofitting these bigger trucks with higher-mpg technology to pump out fewer emissions and lower operating costs.
Ford already offers quite a few CNG car and truck models, and as emissions and fuel economy regulations are dialed up over the next several years, we expect to see more.