Amūn suggests a mount that can be trusted on long journeys. Alwāḥ, the plural of lawḥ, means boards or planks. Al-irān means a large coffin-like structure.
The comparison ka-alwāḥ al-irān does not mean that the camel literally consists of wood. The shared qualities are breadth, solidity, and load-bearing strength. Together, mirqāl and amūn suggest both speed and endurance.