If you live or work in a high crime area, put everything in your van to reduce the chances of theft.
This includes ladder and pipe racks.
Ladders and racks are a signal to thieves that you might have tools, so if you can get them out of site, you should get greater security.
You can do this by building a false floor in your van for storage, using a ceiling-mounted ladder mount, or by using a multipurpose ladder.