Mind out for white vans - their wing mirrors are much stronger than yours.
Don't leave anything on the top bed when you're putting the roof down.
If you're using the inbuilt blinds, be careful with the rearview mirror when you're attaching them - the mirror comes off surprisingly easily.
Careful with the armrests when spinning the seats, they can gouge chunks out of the door if you're not paying attention.
Can't think of anything else I've broken.
Also depending on your van vintage, I think the stereo can run off the leisure batteries so that might not be a problem any more.