At 5260mm long, 2110mm wide and 1764mm tall, the latest in a trio of Maybach concepts is 130mm longer, 180mm wider and 86mm lower than today's second-generation Mercedes-Benz GLS. For comparison, the Bentayga is 5140mm long, 2000mm wide and 1740mm tall.
These dimensions are claimed to mirror those of the production Mercedes-Maybach GLS, which is due in 2019.
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Inside, the Vision Ultimate Luxury is furnished with fine leather, wood and rose gold.
The concept, which rides on towering 24in wheels, runs an electric powertrain. In a set-up similar to that of the Mercedes-Benz SLS Electric Drive of 2013, it uses a quartet of motors, with one acting on each wheel to provide fully variable four-wheel drive. Combined output is 740bhp and top speed is electronically limited to 155mph.
Energy is stored in a battery housed within the concept's flat floor structure. With a capacity around 80kWh, it's claimed to provide a range of more than 310 miles.
The Vision Ultimate Luxury is charged with a DC system that allows a capacity of up to 350kW. Mercedes-Maybach claims five minutes of charging provides sufficient power for 62 miles of range. Alternatively, the concept can be charged at public charging stations, from conventional mains power and inductively, through a contactless plate.
Although Mercedes officials refused to be drawn on the plans for the new powertrain, it's suggested that it could form the basis of the EQ S saloon, which is due to enter production in 2020 as part of a family of EQ-badged electric models.