This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 輡 is uncertain. It combines 車 (vehicle) with 臽, but the original meaning and component function are unclear.
Since the meaning is unclear, picture a mysterious old vehicle (車) with a strange right-side part (臽) that no one can identify. Its purpose remains unknown.
For カン, imagine a can (カン) tied to the back of this mysterious vehicle, rattling as it moves. The can sound cues カン.