Vehicle Despawns

Encountered something last night; was towing a vehicle via helo for a while.  Untowed it and landed to do a mission on foot.  Came back and it was gone.  Now, mission time resolution was no more than 15 minutes. 

The only thing I can figure out is that the towing time doesn't count as a vehicle being used; meaning it's considered abandonded.  Luckily had pulled crates out from previous mission to access, but didn't drive it. 

If this is the case, can you set it so that towing is considered "in use" and not abandonded?

Thankeee

Actually, when a vehicle is towed or airlifted, its respawn timer is reset and freezed. The issue is more likely to be related to the towing system or FPS fix; most of their issues were fixed in v0.9c, although many servers including TPG currently run v0.9b

Got it, thanks!