Wonderful!
Sometimes it is hard to know exactly what colour something should be. What I tend to do is bring a picture of the real item in to my paint program and pull the colour to see what it actually is. While the first picture's container is certainly white in the picture, if you pull it in to your paint program it will come in as grey, nearly balanced between R G and B, at around 70-75% intensity. The blue is around 60% intensity.
In the second picture of the truck and trailer, the white tanker is oversaturated in the picture and comes out almost pure white.
Adding the shading to the east side will help a lot... and the south should also be slightly less bright than the top part.
Great work!
EDIT:Was playing around with a container in Blender and a Maersk graphic. Feel free to grab the colour scheme and Maersk logo (or the whole thing if you like):

It is interesting to look at a zoomed in version of this to see how the pixels are assembled. (if the image in your browser is a bit blurred with extra anti-aliasing, download the image and view in your picture editor)