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I got in "the bubble" undetected by the driver (I'm pretty sure) and hung out in there for a looooong time (150 miles at 75 mph!). I noticed that when I pulled in real close- maybe not 2 feet but... let's just say not far from that- I had to back off the throttle some and the temp gauge suddenly shot up. Bike had no windshield and I had my visor up- amazingly calm back there
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this makes since. my father and I drive semi trucks. and i remember being told that the bull haulers have a small section in the front of the trailer blocked off because the truck part would push the air out of the way, and inside the very front of the trailer the turbulence would create a vacuum bubble behind the sleeper and a few feet in the trailer at highway speeds. and the animals would pass out from lack of oxygen! that may be a bs trucker story i have yet to find facts on that, but I do remember trash cans are easily sucked from the side of the road if you get the rear of the trailer just right
I think the main reason truckers don't like people back there is because you cannot see them for like 200 feet behind the trailer. you have to manage the space around the truck because if an emergency comes up you will need to know the best way out without killing someone. also a light rear end car to car will result in some broken plastic and hurt feelings, that same accident with the rear of the trailer there is heaver damage to the car and greater chance of injury. and insurance company's almost always find a way to blame the truck driver.