then they would still have to eat, sleep, and leave their bowel movements..
Not to mention - bury their dead; mend/discard worn out shoes, clothing, and blankets; discard unwanted luggage; abandon ruined carts; lose things by accident; leave trail messages for those bringing up the rear; light fires for warmth, comfort, and guidance; and there is that whole "melting down hundreds of pounds of gold jewelry to forge a golden calf", which would have necessitated burning tons of brush down to charcoal and then improvising some kind of bellows.
All without a trace. My, how amazing!