course it is possible whats wrong with the long stuff on the roof??
here is my work wagon minus roof bars
most people dont realise its a van with the trend for rear window tints
but it is!!
it depends what work you have to do and where you have to take it i would say it is going to get messed up though and punctures on those expensive low profile tyres ouch!!
also if you do go on site be prepared for the nickname hollywood or similar