I am guessing that lorries are truck cabs? Like 18 wheelers?

Lorry is the English word for "truck" in the sense of large cargo vehicle. Both 18-wheelers ("articulated lorries" or "artics") and 8-wheelers count as lorries. If it's too small to be a lorry, it's a van, though the boundary is a bit vague.

While we're on, what's the difference between a truck cab and a "rig"? In English the word for the front bit of an artic is "tractor", though it doesn't seem to be used as commonly as Americans use "rig", possibly because long-distance road haulage isn't perceived as macho-romantic in England the same way it is in the USA.

Unusually for this BBS, I'll also address the matter in hand: we've heard of several empeg installations in aeroplanes (including one sodding big aeroplane), one in one of those huge six-wheeler luxury stretch humvee things, at least two in boats, and one in a personal submarine.

Peter