פירוש על ברכות 35:11

RATHER [ACCORDING TO] THE LATTER CLAUSE, IT IS PERMISSIBLE TO RIDE ON THEM BECAUSE OF BANDITS. And the same comparison of sefer Torah to a corpse applies for carrying a sefer Torah hanging from one’s back. It is permitted even when there are no bandits pursuing him.

In time of danger he may pack the scroll into the saddle-bag and ride on the ass.