Vehicles commonly used include Jeep, Nissan Patrol, Toyota Land Cruiser, Land Rover, Ford Bronco, Suzuki Samurai, International Harvester Scout. Also, vehicles like the Mercedes Unimog due to its portal axles and greatly increased ground clearance. These vehicles are outfitted with custom parts. Power is usually not an issue, as rock crawlers typically lower their gear ratios in order to drive more slowly over obstacles without stalling the engine. These custom parts can include: