The Can-Am Maverick X3 is an off-road UTV (utility terrain vehicle). It represents the buggies used by members of the Delos Extraction Team, Westworld QA Security Force and Westworld park staff as a means of transportation throughout Westworld.
Both the black-coloured, security team version and the white-coloured, park staff version, are introduced in the first episode of the second season. The security version is seen throughout much of the season and the park staff version is seen more prominently in the second half of the season.
In the show, the vehicles appear to be electrically powered - from the sound they make in operation. However, the vehicles used are actually powered by petrol engines.
The real world vehicle is manufactured by the Canadian company Can-Am Motorcycles, a subsidiary of Bombardier Recreational Products, until 2003 a division of Canadian heavy manufacturing company Bombardier Inc.  The version used in the series is a four-seater variant, the "X3 Max X RS Turbo R", with a "Side by Side" seating layout typical for UTVs. 
One of the modifications carried out on the series' version of the vehicles are the wheels: They're a type with airless, reinforced tires, preventing the issue of flat tires. Presumably to account for the rugged terrain in Westworld and the other parks, and to ensure the Extraction Team avoids vehicle repairs in case of a crisis and low supplies. (Such as the ongoing crisis after the host uprising, when the resorts and their guests seem to be cut off from the outside world.) 
The park staff vehicles come with a rack attached to the upper back part of the body, for carrying supplies or smaller useful cargo.
- Mesa Hub vehicle bay - The main home base of the vehicles.
- Maintenance cart - The equivalent of the park staff buggy in the Westworld film.