A standard vehicle suspension consist of a spring and a damping device also know as a shock absorber.   The idea here is to take the kinetic energy of an impact and store it in the spring while the damping device slowly dissipates that energy.   This is important because roads are not flat and smooth, which means each bump is actually an impact that could damage you or your vehicle if not properly absorbed.

Having a patent grants the owner the right to exclude others from making, using, offering for sale, or selling the invention throughout the United States of America or importing the invention into the United States of America.

A prototype is the first thing or being of its kind and is usually tested to make sure that it functions the way it was designed to.   (And testing is important, since thing don't always go as planned.)   While a proof of concept passes the functional test, it may not be ready for production.   In this case the Proof of Concept was tested using a small (haphazard) vehicle that was meant to simulate a real one.   And a vehicle suspension is a support device that keeps the tires on the ground while keeping the passenger in a somewhat level and comfortable position (suspended above the ground).