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Here is a picture of the actual Mobile Examination Centers (four 18 wheelers connected via walkways.

These centers are vital to successful data collection for several reasons:

Provide a standard environment
Standard equipment
Standard specimen collection
Standard staff procedures
Automated data collections
Minimal site-specific error. There are 3 sets; 2 in operation while 3 travels.

Mobile Exam Center
http://www.cdc.gov/nchs/about/major/nhanes/mectour.htm