To put it in a firmer tone:

DO NOT PUT YOUR PRECIOUS CHILDREN IN THE CARGO AREA!!!
The cargo area is NOT designed to protect anyone back there in the event of a collision, it is a crumple zone. The sides are not reinforced with steel pipe beams like the doors. The materials are not cushioned against striking a person (or vice versa).

Those add-a-seat kits should be outlawed...
Brent
_________________________

Tip: see if your question has already been answered before asking it. Try our handy-dandy search tool!