I know people always say cone area is king but which setup will have the potential to be louder in a truck. Four sa 10's ported on 3500 watts or two zv.4 12's in a fourth order with about 3500 watts

And like usual NO ONE can answer that question. Way too many factors.

Terrible question, too many variables to answer it, and why the hell would you want a fourth order bandpass? You've been a member here for four years and your questions are still poorly written and not well thought out.

I didn't read that as BP, just as a ported box. Nowhere does it say bandpass. If so, that is flat out stupid.

im asking which setup will be more efficient if all the subs are given their rated rms with the proper electrical and optimum required space . im starting to look into fourth orders because i hear a lot of people saying that their more efficient than the traditional ported enclosure.

You need to stop reading where "a lot of people area saying" stuff as they obviously are confused.

As for your efficiency question, I suppose those same people answered. If so it furthers the fact that they know jack as the parameters you gave us were not enough to answer.