The only stupid question is "Are we there yet?" I mean, look out the windows kids! Does it look like we're there?
The two moisture traps will cancel each other out and actually create moisture.
No, I'm KIDDING, I'm a kidder!
You will probably not notice any difference, there may be a very slight drop in air pressure, but not enough to measure.
Remember the old saying:
"You can never be too thin, too rich, or have dry enough air."