It might have been DOJ. I remember seeing a fuel truck used to fuel a helicopter. My issue right now is my fuel system relies on fuel pumps and I need a way to get one at the airports but I don’t know how to make a custom map.
Download map editor or menyoo for singleplayer off gta5mods, make the map with props. When you are finished save it as an xml. Then use the xml to ymap program on gta5mods, import your xml, export as a ymap. Drag that new file into OpenIV and done. You have a ymap. Add it to a stream folder and make sure you fill in the __resource.lua correctly. Make sure to start the resource in your server.cfg. If you want to find props that are default in game use codewalker.