Hey there Lone Ranger,
I am very curious about what kind of information you found about a PPD. I actually have a malinois that is suited for this work- I'd only need a bark protection and not the bite- but I am wanting to benefit from the research you've done so far. Basically, she needs more advanced OB and control to discriminate threat from not (working on that) but she is not a so-called "nerve bag" and has what it takes. Please link me to some of the information you've found.
By the way, your site is really interesting. I'd love a caravan, if I lived in Oz intstead of cold Alaska with no sunlight in winter and so no. It would be a great way to travel with the dogs!
Good luck to you, sounds like you have a solid head on your shoulders and will do right by your dogs.