Fuel truck - finishing the model

Here is the finished Jet fuel truck this is my third model for my trailer. I finished modelling the front of the truck including the headlights. I didn't spend too much time on the headlights as they will not be viewed close up.

Front view of the truck

Rear view of the truck

When adding the texture for the truck I removed the materials that were applied this included a grid image used as an opacity map on the top of the model. I didn't know how to apply this back to the model so it is currently not in place.