RDWC Manifold Question

I am in the midst of designing a system for my tent moving forward.

4 totes , 2 on each side with an equal splitting manifold and draw returning to the tank.

So if I'm pumping say 400 gph , hopefully if split proper 100 to each.

Is there a reason to have the additional manifold across the back connecting it into a loop or would a U shape work just as well , pro's con's ?

Thank you

u shape works fine. pipe your return into the middle of the u. keep it as simple as you can, youll thank yourself later