Odd Scania

Yesterday I saw what seemed to be a rather odd Scania 6x2 unit. This was hitched to a tank trailer so I presume that there were no issues with overall length, but the unit wheelbase was about a metre longer than normal. The centre axle was on smaller size wheels, but not the often seen tiddly ones. Are these units fairly common? what is the reason for the extra inches?

cav551:
…what is the reason for the extra inches?

I asked my ex the very same question.

The extra inches are overrated. .

the nodding donkey:
The extra inches are overrated. .

Only the first twelve or so, have much real effect.

So I`ve heard.