Thanks for the info, I've been doing this mission for 2 or 3 nights now. The vague description and narrow completion objectives make this mission 100% NOT fun in my opinion.
I've wiped out practically everyone, demolished the lighthouse, blown the Ifrit, etc....turns out I "failed" because trucks are the most important assets...apparently.
Bohemia Guys, if you're going to put in such open ended objectives please make the AI/completion triggers robust enough to not waste our time like this.