Shipping firm Maersk says it’s preparing for resumption of Red Sea voyages after attacks from Yemen - POLITICO
and
Analysis: Has the US-led Red Sea force calmed shippers amid Houthi attacks? | Israel-Palestine conflict News | Al Jazeera - "Maersk will resume shipping through the Red Sea but concerns remain. Meanwhile, France, Spain and Italy have dropped out of the force."
The Samad-2 carries only 18 kg of explosive. A more potent antiship missile, the Russian
P-800 Oniks (Yakhont) can carry 200 - 300 kg of explosive, but it only has a range of 120 km for a low-altitude trajectory and 300 km for a high-low trajectory. It uses a ramjet engine, and it travels at Mach 2 near the surface and Mach 2.6 (750 m/s) at high altitude (10 - 14 km). Its length is 8.9 m, its diameter 0.7 m, its wingspan 1.7 m, and its weight 3.1 metric tons.
For the US,
Trailer Dimensions - Stream Logistics I looked at a semtruck dry-van trailer. Its internal dimensions are typically length 16 m, width 2.5 m, height 2.8 m. European ones are similar.
Thus, it's easy to hide these missiles if one can remove their wings.