Derek Geldard wrote:
According to a trucker on the rajo.

They take an axle out and use the space for an extra large fuel tank.

Around our way there are some trucks parked up with massive tanks
between the cab and the, um, load. It's a bit like the days of the
steam engine all over again. The tanks are the full height and width
of the cab, but only extend back about two feet. That still makes them
about 450gallons, though, by my reckoning, or about 4000 miles or so,
I think. Should keep you going.

Dan.