I don't have exact figures, but the complete rig including the tractors was around 200ft long, 26ftwide, and about 30ft high to the top of the truck headboard....
Movements like that happen literally all the time. Every machine to get overhauled will be pulled out of the mine and sent to the dealer's shop. One of the reasons is the anal safety/security rules on most of the big mine sites, the hoops suppliers have to jump through to get men & materials on to the site, and often something like obtaining sufficient accomodation on site. Despite the cost of moving the machine off the site and back again something like an overhaul (or a new build for that matter) can be done much faster & cheaper off the mine site. There is also the small matter of the altitude to consider. The mines are generally at around 10,000ft, some are as high as 15,000ft - the dealer shop is at 1000ft...... Human beings work better when there's oxygen in the air, or so my experience tells me.