We hauled thousands of loads of plastic pipe out of a factory in Bristol, IN from the 70s until the plant closed in 2009. Large pipe like that in the picture should have notched spacers between each layer, or its not going to stay stacked straight, ain't gonna happen.
The big secret to hauing plastic pipe is to stop often and retighten the straps. When we first started hauling plastic pipe, they allowed us to use chains, but that was a real nightmare and they soon required a minimum of 12 30 foot straps for a load.
Small diameter 1", 1 1/2" and 2" schedule 80 pipe got really heavy, one load we hauled was over 50,000#.
As to the strap ratchets, they are required to be on the driver's side.
There used to be a pair of sharp curves on SR15 south of Bristol that claimed 10 or 12 loads of pipe when the drivers took the curves too fast or had not secured the load properly. Usually made quite a mess.