I don't know about that but I do know that we declined to target the convoys for a very long time, beginning only after Russia more or less shamed us into it. Our reasons for leaving the convoys alone was that the tanker trucks were "infrastructure" and would be needed in a post-conflict Syria.
Actually, that sounds like a very good plan. Fly by once and warn. Come back for a second pass and take 'em out. No possible response other than to leave the trucks.
__________________ Smoke me a kipper. I'll be back for breakfast.