Hi Joe,
You are asking about the FWD trucks that were part of the Canadian radar convoy, there is a restored HAR-01 for sale in England currently, see here:
http://www.milweb.net/classifieds/vi...ad=82164&cat=4
I am involved with the Corowa Swim-In military vehicle event in Australia and was instigator in obtaining a ZPI trailer to use as the event's office. Since then two other ZPI trailers came on the market. These two have been bought by two other military vehicle groups, one in Sydney, the other in South Australia, both to be used for similar purposes. It is known that Truck Engineering had the contract to build the ZPI trailers, but one of these two had a build plate of Massey-Harris Ltd. Through my research, I found out that Truck Engineering had rented part of one the Massey-Harris factories, and it may be likely that they were helping keep the production up. Electric brakes were also mentioned, yes they were fitted with Warner electric brakes as far as I know.
Mention was also made about generators, one of the two FWD's had a Cummins powered generator in the body.
regards, Richard