Since this appears to be, like, a big federal secret, I'm going to post the deck heights *I* got when I went out and measured treadmills myself. Obviously they're nowhere near exact, but for gods' sake, it is totally ridiculous that you can't find this information anywhere. The guy at the treadmill place told me the info is available for commercial models, but never for residential. This makes zero sense to me, since I've never seen a low-ceilinged gym, but I know plenty of people with older houses that don't have ten-foot ceilings in their basements.
According to the treadmill store, the Landice deck height is 4 7/8in. This is the shortest treadmill out there. It costs an arm and a freaking leg. Unfortunately, nothing else out there is nearly as short.
All the Nordic Track models I measured were TALL- 7-8in off the ground. There was one I did not bother measuring because it was even taller than the 8in model I measured. These are for people with McMansions, I think.
I measured a few ProForms and they were all in the 7.5in range. I currently have a ProForm which I LOVE, but it is also currently dismantled so I can't tell you the exact deck height on that one. The guy at the treadmill place said he thinks ProForms are crap. Of course he said that, they don't cost three grand. I will tell you that I USED that treadmill- as in, for running. Not for walking, and certainly not as a place to hang my clothes. It had zero problems, and if height isn't a concern, I'd recommend them. Your mileage may vary, no pun intended.
I measured one Sole treadmill (didn't get a model number) and got the deck height at just around 6.5-7in.
I didn't go to the Sports Authority to keep measuring, because I was tired and the writing was on the wall. The Landice appears to be the only usable treadmill for tall people with shallow basements.
Y'all are welcome. And to the treadmill makers: you'd probably sell a lot more treadmills if you would TELL people how tall your stupid treadmills are. Or maybe not, maybe you're banking on people going thru three treadmills before they find one that actually fits. I'd like to think not, though.