take all the papers/docs with you,

last time we went thru boarder crossing from CA side into the U.S.,(July 2010),there is a line waiting, the agent checked all the passports, counted heads in the car, asked me to take off glass (I was waring a sunshade), then let go.. don't forget copy everything, keep in a seperate place, in case originals get lost.. bottom line, cover all bases.