Carpet is unsanitary in any circumstance and especially in a camping trailer. While it may feel warm and fuzzy in the morning, it harbors dirt, mites, and other unmentionalble creatures that are impossible to remove with routine cleaning.
If you want proof, put a white towel down in a traffic area of your home and see what it looks like in a week.
Go with something hard and easy to keep resonably clean.
Easily distracted by shiny objects.