Here is what I would call a chassis dyno http://www.maha.de/roller-function-tester-fps-2700.htm
These are very very noisy, because the tires are moving at 70 or 80 mph (whatever you set) and make as much noise as tires going 70 down a highway (only 1 axle though!)
A rolling road is different in that the floor moves under the car, not just rollers under 1 or 2 axles. Like this http://www.qmtmag.com/images/Windshear_RR_05.jpg
The chassis dynos are noisy, these are super noisy.
Disclosure: I sold Maha dynos from 96-2000 with SnapOn/Sun branding, about 40 of them.
A rolling road is different in that the floor moves under the car, not just rollers under 1 or 2 axles. Like this http://www.qmtmag.com/images/Windshear_RR_05.jpg The chassis dynos are noisy, these are super noisy.
Disclosure: I sold Maha dynos from 96-2000 with SnapOn/Sun branding, about 40 of them.