HumRaider

I just recently recieved this old 1976, Toyota Raider Camper from my friend and I can not for the life of me find out any information on it. The Vin. # is nowhere to be found and I have scowered the internet to find anything on a Toyota Raider and have come up dry. Toyota Eclipses, Sunraders, Chinooks, you name it, but nobody showed anything on the Raider? And it definetley says "Raider" on the front of the Camper bed and bumper. So I am confused, can anybody help me?