Taking Goods to Spain

We have done 2 journeys, the first in a car using the tunnel and driving though France just waived through, the second in a van to Santander at the check point we were sent over for a check, back and side doors open a quick look in, a couple of question and of we went. They were were not interested in looking at the paperwork that we had prepared, but they were in the progress of going through a van in the next bay to ours.