Vent window positions

Question for those of you that own window vans; I am assembling my camper and it only has two of the tip-out windows. Where is the better spot for these windows- the side or the rear doors? More importantly why?

Thanks

I have opening rear windows in a 3rd Generation Econoline. when you have them open when driving they suck in Exhaust Fumes! Bad News!

I have a modern E-250 with tip-out windows in the rear doors and love them; they do a good job of venting out dog smell, gasoline odors, farts, etc. I only get a hint of exhaust when the engine is cold and pulling out onto the road initially; after that nothing.

I'm curious how the tip-out windows work on the side of the van. It appears that each window is positioned differently- one as a "scoop" and the other as a traditional vent. The scoop orientation seems a bit extreme in how much air it could direct into the van. It looks like that window would create a tornado inside. What happens when both windows are open? Does air simply short circuit and just go in and then out the other window? I have never driven one of these vans so that's why I'm asking.

Ford put the "movable glass" window on the side doors and the left side wall. They never put them on the rear doors, though they do fit.

If you drive with them open on the back doors, make sure you have open vents/Windows at front of van to force air out the rear door Windows.