You mean RT-01? It's a Roving transport. It was documented on the Weyland timeline
In 2051 we find a mention of the RT01, obviously the first generation of the vehicles seen in the Prometheus trailers marked as RT02:
"RT01 GROUP TRANSPORT : Weyland Industries makes essential updates to on-planet transport. The new vehicle is capable of traversing any known terrain and has virtually no weight limit for cargo, passengers and equipment."