The first version of the Texaco tank truck premium was this 1959 BuddyL toy. It was hugely popular, sold by the tens of thousands, and is very easy to find today. Appears to be a GMC replica.
The familiar "TEXACO" brand name was boldly splashed along the trailer sides while the "GreenT" door decal was a bit undersized and almost out of scale. Nice looking truck, nonetheless.
Maybe the "Baked Twice" process was responsible for the large number of survivors today.
BuddyL toys were all made at the Moline Pressed Steel Corp. in East Moline, Illinois.