Speeo, thats exactly what I was wondering. Thanks!
Good point all.
I made an assumption based on the fact that the cables were possibly never tightened and the rear brakes do have an "automatic" adjustment. One other thing I noticed was when I release the brake lever (since I've tightened it), it goes totally loose my rear brakes still grab a bit, enough to stop the truck if released on a gentle hill. So my feeling was, if after I tightened the cables the brake lever doesn't grab enough when fully engaged and grab's some when released the cable's must have been stretched past the point of adjustment.