Also known as road trains, or land trains.
Dr. Carter is a well known (at least in academic circles) as an Indiana Jones-esque scholar of the occult and professor of pre-human culture, a Mars born swashbuckler in her youth, now a tenured and crafty acquisitionist.
"Yn these landes, theye do ryde upone greate flowtinge beastes alike as those thate ye fyshermen do calle nawtilus; Ande these beastes, callede 'pyky-pyky' because of ye noises thate the beastes make, are troubelsome ande beastlye mountes, withe fowle temperes." -Telliamed ap Ynris, "Ye Westerne Landes".
(A levitating giant nautilus that makes a noise like "piki-piki" and is thus called a Great Piki-piki.)