I had my van done in ikea its a expert van, same scenario side door . you can de activate the central locking by taking the switches off the door pillers its a 2minuet job. as for the dead locks don't waste your money I had some fitted on my van it was broken into a second time different place because I had those locks fitted at a cost of 450 quid they caused 600 quids worth of damage new door repaint etc.i took them off instead I got an alarm and a inertia flashing light to hope fully deter any further attack.