Police were alerted to the unattended bag's presence at about noon.
"We are fully supportive of measures to keep our community safe."
The truck's cab can be seen suspended several metres above ground level.
Emergency services were called to the crash on Wednesday night.
Wellington Alliance Against Sexual Violence's Aleisha Amohia said sexual harm elimination needed a specific focus.
There had been concerns for the pod's safety with several low tides.
"This isn't an action we often take."
A post-mortem will be carried out on Thursday.
The man was arrested in Levin after a search warrant was carried out.