That is crazy high, but in a way it is simple logistics.

You don't make any money moving an empty truck--only a full one. So when 1-way moves are out of balance, rentable vehicles "pool" in certain areas and get scarce in others.

The only options they have is to have employees drive empty trucks back to the needed areas which is 100% money loser, or adjust prices to try to influence the trucks to "flow" where they are needed.