The black plastic box in your first two pictures is your battery charger, it converts 240v hookup to 12v and charges your main and leisure battery
Controller is obviously eberspacher,but the under van unit is not normal,
it should be a square-ish box about 12" x 18" and be under the van/sliding door
added
the clip beside the battery charger(left side looking to rear) should hold the eberspacher control relay