[euromodder]

Your ordinary toilet roll is essentially a large hole mounted on a thin roller.

One of the issues is that rest areas use bigger rolls on larger diameter rollers.
Being bigger, the rolls are also heavier.
Using a bigger diameter roller, means more rolling resistance
Being heavier, they are harder to get rolling and keep rolling (Newton and rolling resistance).

The end result : the force needed to overcome this inertia is close to the sheer force of the (partly) separated sheets ...