Two 94-tonne electrical transformers bound for a green energy project arrive by ferry from Rotterdam. Veteran heavy haulier Gavin and his protege Rob must transport them from Immingham Dock in Lincolnshire to Aberdeen. The three-day, 450-mile journey will be on 116 wheels, attached to two 630BHP Mercedes trucks and two 27-metrelong trailers. Including support vehicles, this convoy is as long as a football field, and tomorrow they must meet their Police Scotland escort. But getting north of the border today will prove an almost impossible challenge. After an hour on the M180, there's smoke billowing from Gav's trailer. An impromptu hard shoulder stop has Rob getting down and dirty to clean a brake airline. In west Yorkshire, with M62 traffic rushing past, there's another smoking brake that can't be fixed by Rob, so a mechanic is called to pry the brake shoe free. Now the race is on to escape the county's rush hour heavy haulage vehicle embargo. At an average speed of just 30mph, making the county line in time will be touch and go. And today's challenges are by no means over. Meanwhile, in Warwickshire, driver Tom must secure the contents of a Portakabin before lifting it onto his trailer by crane and delivering it to a building site in Battle, east Sussex. Almost as tall as three camels, this load risks being displaced by wind. But the real and present danger is the tricky unload. When Tom arrives, he must deal with an unforgiving slope that proves difficult for his lorry to climb, and he finds it even harder to find a stable position to lift the load without lorry and cabin toppling.