I have to respond to this one. It's personal.
I lost my father-in-law (Roger Gray) back on June 7th. He was a great guy and was like a second dad to me. He started his own truck and car repair business back in 1963 (Gray's Garage) and worked in the business for over 45 years. With only a high-school education and training in hydraulics from his service in the Air Force back in the early 1950s, he built several of his own wreckers from truck or semi chassis! I personally watched him build one from a Peterbilt semi back in the early 90s. I have always been blown away by his knowledge of all things mechanical. He taught me a lot and I miss him greatly. Here is a pic of one of his first wreckers as well as the newest one in the fleet (which he did NOT build). Enjoy the wrecker pics.