Due respect and since you sorta snapped at me about how long do we go for; if I could afford 15 days at the GF, I probably wouldn't be worried about the fees associated with overage on luggage weight much less doing my laundry. It's all relative, I guess.
We usually go for 5-7 days and yes we have always flown (this will be our first driving trip coming up in Dec). I can't afford to be gone longer than that at a clip. I confess that we never go during the hot season and that yes, I do wear clothes over again so long as they don't stink and are not dirty.
I guess, since I don't care one way or another, I should have just kept my comments to myself. Now I know.