The general category for stuff that fits nowhere else or has only one entry and so does not deserve its own section of the guide, the Misc covers some interesting objects for your farm and farming!
The Low Loader is used for transporting vehicles that you want to move on roads but are either too slow or too delicate to do so. The Lizard Tanks are, obviously, used for holding, transporting, and dispensing liquids. In this case petrol and water.
You may find that staging petrol tanks at your satellite farms is a far more efficient method for refueling your farming machinery than taking each device to a petrol station as needed. Just saying.