I would go postwar. The electronics tend to fail after a time in the newer ones. Plus they are way more complex. In my opinion the 'electric eye' to prevent loading when a car is not present was unnecessary to add. These accessories were over-engineered. Watch the boxes, they are even wrong. The culvert unloader pictured on the box shows the postwar sliding counterweight which is not present on the accessory. The sliding counterweight gave the accessory a 1930's industrial look to it.