Cool finding! How did you find that the bike is on the roof?
Btw, I have problems with H/FP/PP Barracks OL. My taxis are despawning too. Also I can't see any traffic on the streets to find one. @RationalPsycho, where did you find your taxi?
Well, as you know, finding things doesn't quite work that way How should I describe it... I first found about this Ventoso and its spawn coordinates in the script. Recently, I read an older post of Bender.'s saying that the Ventoso is generated in the second cutscene inside the Mall, but he couldn't find it. Neither could I. Then I suddenly asked myself the question "what if it remains a mission-important vehicle until the mission is finished"? And, having gathered enough experience about marked vehicles in LCS (marked, mission-important and owned by script is basically one and the same), I assumed that it must have fallen through grey hell and respawned back on land, so I started to mess around for a bit; I used a helicopter to glitch my way into the underworld, found the Mall interior
and kept going down to see where exactly I spawn. After taking off, I accidentally noticed something unusual; a BMX on the roof. It was the one that starts "Mashin' Up The Mall" being teleported on the roof above its spawn point - the exact same as the Ventoso's. I went inside the Mall, hopped on the BMX, got back outside, and found two BMX on the roof. I memorized the observation. Today, I made the connection and asked "what if... FUKKEN' VENTOSO?!" and looked into the mission itself to see if I can find the bike, and I did
And this is how things are generally discovered; researching, observing, coming up with ideas, asking the "what if" question, and putting the ideas to the test. Or sometimes by accident. This discovery had a bit of everything
About the Taxi for the Barracks OL, well, I found it on the street, driven by a non-player character, and it happened to be marked (so was the one Lennart - found), so it didn't disappear. Parked ones are never marked though, and there is no known consistent way to mark the ones driven by NPCs, so you have to be lucky. If you wait in front of the bridge for a while, chances are you'll find one. Don't take my word for it though. In this game, Taxis and Cabbies are very weird; they can't be left in memory, but can somehow be marked. Marked ones can be stored in garages, but are unmarked afterwards. This is also the case on PS2. No idea what's going on, really, so I can't help you much. If one has been marked before starting "From Zero to Hero", it might pass by as you wait on the bridge.
By the way:
Thanks for the credit