For in dash components, if you really want to go that way, go to ‘ Crutchfield.com ‘. They have a very large selection of products and adaptors plus good customer service.
When entering your vehicle information, you can use Econoline. The dashboard is is same in a 150 Econoline to the E450 cutaway.
Others will suggest individual units for dash cam rear view monitors, your choice on products available and $$.
Ken
2006 Winnebago Outlook 29B E-450.
2012 Honda CR-V AWD
Blue Ox Aventa LX tow bar and Brake Buddy Vantage.