Is this JDs truck? He had a lot of information and contacts all over the country. The other one that I know of is in Chilliwack, and reasonably fitted in the interior when I last saw it. Somebody from there should reply here if not contact you directly. A few members here have posted in the past regarding the interior arrangements. Search is your friend...
Here is the link to JD's M152 site form those who have not seen it before.
http://www.signaltelecom.ca/M152%20I.html