That is a Truck, 3-ton, 6x6, Crash Tender (Ford/Marmon-Herrington MM5-6) - see my web page
http://www.mapleleafup.nl/marmonherr...truck_cdn.html
A very desirable vehicle, if you ask me!
It is advertised twice, here is the other ad:
http://www.kijiji.ca/v-heavy-trucks/...uck/1109487796