[SuziQ]

The guy may not have vanished, he may just not have access to the white truck on the weekends. Several freepers on other threads have suggested that the sniper strikes during the week when he's on the road for his job. They pointed out that he hasn't struck during a weekend, so that's what supports their assertion. Could be.

[Sacajaweau]

I think they strike during the week because whoever is running this (their safe harbor) is going to work and keeping to his normal routine etc..

On weekends, they all get together to discuss the next week. To those around them, it just looks like a couple of friends who often visit on weekends.

Sac