WORLD A: Yanacocha
PURPOSE: The most common vehicle that will be used in this world would be Haulers. As a mining planet, precious ores and minerals needs to be processed and shipped to another planet which will use the processed materials for manufacturing.
REQUIREMENTS: Due to the hostile environment that the planet has for human life, all types of vehicles must have these requirements when outside the dome city.
* Air-sealed, self contained system - Since there is no breathable air in the world, all vehicles must simulate what planes or spaceships have. The vehicles need to be able to provide oxygen, remove C02 and keep the air pressure at levels where a human can live properly.
* Structurally solid, and armor - As the inside of the vehicle has a higher pressure than outside, it should be structurally solid to withstand the difference in pressure. Not only that, it needs to be able to withstand the deadly dust storms (assuming that these graphite dust storms are indeed deadly) that happens within the planet.
POWER SOURCE: Typical combustion engines are out of the question due to the composition of the atmosphere. Batteries can be used to power small vehicles, but for the larger ones like Haulers, a nuclear reactor is recommended.
PROPULSION: With a hostile environment, wheels can still be used but can cause wear and tear more than usual. Instead, to be able to haul large amounts of ores, as well as lift all the requirements and power source, heavy tracks are the way to go. 199
Large tracks similar to NASA's crawler transporter but wider could be used. It needs to be wider due to the higher gravity, so that it exerts less pressure on the ground. So you can imagine how big the Hauler would be.
World B: <PERSON> There's not really much of a problem when using any typical vehicles that we have for a lower gravity planet. The lower air pressure maybe a bigger hindrance for helicopters and planes. The atmospheric pressure of World B is similar to Earth at 3500m above sea level. Typical helicopters would be able to fly up at least 1km above sea level with such a low air pressure, instead of 3-4km at Earth. Planes would fly lower, and possibly are more inefficient than what we have on Earth.
With a low gravity and air pressure than Earth, it maybe more economical to have rocket-propelled planes instead (SpaceX?). 947