VIS = Vehicle Inspection Service
VIS is an undercarriage diagnostic system that automates the inspection of brakes, steering and suspension components.
Here's a PDF File with detailed information and functions of a VIS inspection.
Remember, as with any type of diagnostic test the equipment is only as Good as the technician who operates the equipment.
At one point VIS had a nationwide service provider locator on their web site so you could locate the nearest service provider to your location but they removed that function from their web site back in 2007.
Your best bet is to either contact VIS directly via the information below or to call any large Kenworth, Peterbilt or Volvo dealer to see if they have a VIS system.
VIS Orlando Office
2400 Lake Orange Dr,
Orlando, Florida 32837
Toll Free: 866-847-8721
If your in or around Wichita, KS Doonan Truck & Equipment Company (316-722-6034) who has sponsored the annual National HDT Rally has several excellent VIS technicians.