"I think Edmunds is wrong"
If Edmunds is wrong, then Jeep is also wrong. They report the same data as Edmunds. Peak torque is at 4000 rpm. See here:
http://www.jeep.com/en/2008/grand_cherokee/. (I'd provide a more direct link, but they don't make it easy to do that. Just click on Features & Specs, and then Technical Data.)
"I dont think the suburban was over 4 either"
The Suburban currently has 5 engine choices, all V-8. The torque peaks range from 4200-4400. See here:
http://www.chevrolet.com/suburban/specifications/.
"Most domestics (6 cyl and bigger at least) tend to be well below 4000, and trucks will be very much below that."
I'll buy you a gallon of gas (or beer, your choice) if you can prove that claim.
To be fair, I do notice that Ford has a couple of examples tending in that direction. I see a V-8 with peak torque at 3750, and the V-10 peaks at 3250. See here:
http://www.fordf150.net/2007/2007-fo...ifications.php
In the Chevy Silverado line (
http://www.chevrolet.com/silverado/specifications/), there is a V-6 that peaks at 2800, but then there are 5 V-8s that peak from 4300-4800.
"Pulling numbers out of my ass here"
No comment.