I actually discovered I knew less about what I was seeing than my son would have known when he was fourteen years old. He knew the names of all the construction vehicles and what each one did. He used to go watch anything having to do with construction or vehicles. I, on the other hand, had to whip out my Facts on File Visual Dictionary to understand what I was seeing. That dictionary is now out of print, but has been replaced with a later edition by the same author, Jean-Claude Corbeil, now known as Merriam-Webster's Visual Dictionary. The wonderful thing about this dictionary is that you don't have to know the name of what you are looking for. You just find the subject. I was able to find the proper name for the forklift reach truck under Heavy Machinery, Materials Handling. Then the clearly labeled illustrations helped me identify my vehicles.
Since a video is worth many words of explanation, I did record video of what I saw to share with you, so you, too, can watch how a lumber truck is loaded and sent on its way to a lumberyard. I did narrate what may not have been clear. Be sure to invite and curious children to watch this with you. You might want to watch it full screen.