Thanks for all the replies. I understand what you are saying about the dog being closer to the back, but the crate will be on top of a drawers system (by Kalispel, similar to the Truckvault) so that lifts it 10 inches above the base of the suburban, so only an impact by a pretty big truck would be level with the dog. Still something to think about.
For those who provided info on slant front crates, thank you. The only one I'd been able to find is made by Truckvault and they want $750 for it, that seems a bit much for a wire cage.
For those of you who have metal crates like slide ins, do you have ventilation issues in the summer? The main reason i'm interested in a wire crate is air circulation.
Thanks,
DH