Soulpower, no special 'breakin' is need for street tires, unless you plan on autoxing or racing, in which case you would 'heat cycle' the tires. The process of heat cycling breaks down the chemical bonds in the rubber compounds (primarily the tread) and then allows the to rebond to make the bonds stronger. End result is a tire that will abrade less, last longer, and run cooler. But again, no need to do so with normal street driven tires, especially light truck tires.
The only other 'breakin' type thing to do with tires is, that some manufactures you a release agent to help remove the tire fom the mold, and some of this residual substance may still be on the tires. This can make them feel a little slick/greasy when driving till it wears off, but again, nothing you need to do special, just drive and be cognisant to not push it in a corner untill the tires are scuffed in a little.