I've done lots of week long bike tours and I've never had an issue with mold. As long as you can get it setup and aired out within a day, it'll be fine. Like JamesRL, I also camp with a Popup camper and have never had an issue as long as I have set it up to dry out. On a few occasions when touring self contained, I will haul the tent out to dry it off during a break in the days travel.