carriage
輅 centers on a type of wheeled vehicle: a carriage. It is a specific term for a large or ornate carriage used historically.
輅 combines 車 (vehicle) with 各, which likely contributes the sound. The character originally referred to a specific type of large carriage.
The left side 車 is a vehicle, and the right side 各 looks like a person sitting comfortably. Picture a person riding in a grand carriage.
For ロ, imagine a low, luxurious carriage rolling slowly: low -> ロ, and the carriage is so grand it sits low on its wheels.