From time to time I like to build ‘model scenes’, sometimes involving scale vehicles.
With that in mind, I have need to model some recent year (1996-2003) pickup and light truck chassis (to oversimplify, the ladder like frame which the cab and the body/bed are attached to, and also which the engine, tranny and axles are attached to - these are usually painted black, and usually consist of 2 longitudal members affixed with several cross members - hence the ‘ladder’ layout).
Alas, whenever the manufacturer’s own sites show an unencumbered chassis (most images are of possible usages, such as stake bed, utility, dump body, etc.), they naturally concentrate on the cab (3/4 view), and the view of the chassis provideds no real idea of construction or dimensions.
Ideally the images would cover pickups (think Ford Super Duty) , light/medium trucks (such as GMC TopKicks, and Freightliners) and light COE such as Isuzus (in Dry Van usage).
OK, I am taking my one free bump now, hoping the workday crew might have some suggestions… 
Just a crazy thought. . .
Maybe if you went to a model shop and bought a fairly detailed model (or got a copy of the direction sheet) you might get a pretty accurate look at a truck chassis.