Some do. although the primary reason that more don't is that disc brakes weigh a lot more than drums, as well they do cost a lot more. The more weight you have the less you can haul. In my opinion discs are more reliable and provide better safety than drums, but it is hard to argue with economy.
How big is a big rigs blind spot
No.
Yes, they do. That "electronic" system referred to in European trucks is a control system known as EBS (Electronic Braking System), and is a better system than ABS (Antilock Braking System), but is not compliant with US FMVSS121 regulations as a standalone system. That's a control module - the Euro trucks still use air brakes.
yes
Big Rigs Over the Road Racing - 2003 VG is rated/received certificates of: USA:E
Top Gear - 2008 Big Rigs 2-9 was released on: USA: February 2012
55mph
Big Rigs: Over The Road Racing
Big Rigs Over the Road Racing - 2003 VG was released on: USA: 20 November 2003 (PC version)
Top Gear USA - 2010 Big Rigs 2-9 was released on: USA: 14 February 2012
Big Blue Disk ended in 1998.
Big Blue Disk was created in 1986.