My car (minus two rows of seats and with a custom-built floor) is ready to be loaded with my recumbent trike. A home-made ramp makes the loading easy. The previous system is known as the "brute force lifting" system, which was not much fun.
The upper ends of the ramp assemblies have been positioned next to markers on the car's floor. The bottom ends will be positioned at the correct width by the narrow board at left (it rotates 90 degrees clockwise and interlocks with the right ramp assembly).
The assemblies are made of 1x4 lumber, each has one horizontal board and a vertical guide board. The boards are held together by screws. The left assembly also has a thin spacer board held in place by (and rotating on) a short nail. The right assembly also has a small stopper to hold the spacer in a horizontal position.