Sorry if this is not helpful, but it can depend on the door the van uses! Our hab door began to make a graunching noise last winter in Portugal, then refused to move at all while it was half closed! I thought it was the strange Carthago double hinges and tried every lubricant we had to hand, with no joy. It turned out to be the pretend gas strut that limits the travel of the door. Took that off, pulled it as far as it would go while twisting with pliers, cleaned and lubricated the piston, and problem was solved.