Use these to centrally support the pull up bar.
I would suggest a couple of 4x2's across five trusses. I try to mount such items in a manner that the screws (or other fastener) is attached at a right angle to the load direction. I am NOT a proponent of using vertical screws of any gauge, to install heavy loads. You do not say how accessible the trusses are, is the ceiling lined? if so it will be a little harder to install but not a major problem. The manner in which SOME roofing contractors leaves much to be desired. The trusses are less likely to move sideways than they would be along their length. This way you can transfer the dynamic load across several trusses. If you want to pursue this installation then I would strongly recommend that you instal the pull up bar in such a way that the swinging motion is at right angles to the trusses. In your case the "sideways" load is your swinging.
Trusses can support a very substantial load VERTICALLY, how ever they do not support sideways loads too well. You would be surprised at how little it would take to cause some disturbance to the structure of a roof. The house is a brick veneer with tiled roof.
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