The original 19 set group
http://www.qsl.net/ve3bdb/ has a wealth of information on the 19 set. But the site does not deal with the problems that can arise when one is doing an instalation in a military vechical.
there is a huge amount of 19 set info in the MLU but its scattered willy nilly in various blogs and threads. I think that a forum of its own would benfit many people.
I have 2 MK III sets and am in the middle of purchasing a third complete with many bits and pieces.
I have most of the manuals for the sets and copys of the 2nd to 4th line REME repair manuals.