I have been in the used class 8 truck business for 25 years, build dump trucks and have stretched, shortened, or double framed hundreds of big trucks and this is how we shorten them. I did not see the tv show. I will take a look though. I have a complete 65 LWB frame that I am pulling out of a 65 chevy. I was able to find 2 swb frame in 2 days so I did not have to shorten it. Kieth
"TRUCKS!" featured a '65 or so longbed which they cut down to a shortbed. They did not use the 45 degree concept. They "Z"'d the frame The area behind the cab and in front of the rear axle.
You can see it here if you missed it on TV.
http://www.powerblocktv.com/magazine/?pub=2ae59aac&page=30