Roof trusts

Reroofing a house in Fresno, Ca the trusts on this roof run left to right (horizontal) They dont make it across another one is nailed to it and support is under each one. 4x8 sheets went 4 accross 8 up and donwn Im thinking it has to get done right with trust going up and down.

It’s truss and need a picture to tell what you are talking about