To answer a few questions
All our trucks are manual, never seen an auto box, dont even know if Mercedes offer an autobox in this model of truck.
Size wise, i'm not sure on actual dimensions but they are the biggest vehicles we have, even bigger then the box trucks. I can just about fit through a 7ft width restriction on my route so they will be a shade under 7ft wide. The pic does make it look narrower than it actually is. They are dual wheeled and have a max gross weight of 7.5 tons.
You can see the difference in length here
Cab has loads of space, my only issue is that the floor is quite high compared to my old truck but that was custom built from the chassis up whereas these use the base of the Mercedes model its based on and the floor sits on top of the gearbox.
As for the digital tacho that has many of you confused. A tachograph records driving time, speed and daily rests. all vehicles over 3.5 ton are required to have one, they were introduced in the mid 80's to ensure fair working conditions across Europe, original ones record the details on a chart that is inserted in the speedo head at the start of the day. See more info here
Tachograph - Wikipedia, the free encyclopedia
The digital ones were introduced in 2006 and do away with the need for filling in charts, you get a card the size of a credit card almost identical to your driving license, it has a chip and you insert it into the device i pictured, it automatically records all the data and stores it for 28 days. If we have any infringements on driving hours or dont take the correct rests and and pulled up by VOSA (traffic enforcement) the fines are huge, usually $300-$400 per offence, if you are a long distance driver and dont take your rest they can impound you and force you to take a daily rest period which is usually 9 hours or even longer depending on what offences have been comitted. As you can tell we have some of the strictest driving regulations in the world.
Also get a nice stationary tidy above the windscreen