It is probably because of the rear air suspension... Lincolns have an "air" suspension which helps to give it a plush riding feel. There are bags near the wheels of each rear tire that are filled with air upon vehicle start up (or very shortly thereafter). These bags are filled with air has the vehicle is on, inflating if there is a drop in pressure. When the vehicle turns off, these bags are deflated thus lowering the rear end of the car.
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Ships have no wheels. Hovercraft have no wheels.
Rubber is capable of supporting the weight of the vehicle because it is able to contain air. Car tires have tubes that are filled with air pressure and these can sustain the weight of a truck.
Air is filled in tires to provide cushioning and support to the vehicle, improving ride comfort and stability. It also helps to distribute the weight of the vehicle evenly across the tire and prevents the wheel from coming in direct contact with the road surface, reducing wear and tear.
Nitrogen
A 4x2 vehicle has 4 wheels with the 2 rear wheels that drive. A 4x4 vehicle has 4 wheels with all 4 wheels that drive.
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That would describe a vehicle as to having 4 wheels with two of them being the drive wheels. A 4+4 vehicle would have 4 wheels with all 4 being drive wheels.
You can get your 1998 Lincoln Navigator to raise off the wheels by jacking up the vehicle. Jack the vehicle up from the frame. The vehicle will raise off the wheels.
There were 4 wheels on the first self propelled vehicle, built by Henry Ford.
Air in a tire is compressed air. Compressed from the weight of the vehicle and against itself in the tire.