Yeah, in the photos you could see the truck was pulling a very large trailer which to me looks too big for a standard pick up truck to be towing.
I'm wondering if he had trailer brakes hooked up of possibly lost his brakes all together. Other than what's mentioned above, intoxicated, or distracted driving it's the only thing that would make sense for plowing into the back of any vehicles whether cars or bikes.
Current Stable: 2014 XC, Honda PCX 150, 125 SYM Havana.
Born in the deepest jungles of India, I was raised by a friendly bear, until I was kidnapped by a pack of unruly baboons who taught me the finer points of swing jazz, all the while being stalked by an incompetent python and an evil but mis-understood tiger... Ummm, wait a minute, that's the Jungle book, no I was raised just outside of St. Louis, But...in the deepest jungles of a middle class neighborhood .