While Rook endings happen fairly often in chess game, double Rook endings are far more rare. There is not much coverage of such endings in chess books. Nevertheless, double Rook endings are important part of the endgame study. Double Rook endings are also closely tied to single Rook endings, since in many cases a pair of Rooks can be fairly easily exchanged. In double Rook endings activity is very important.
Rooks coordinate particularly well when they are on the same line of file.
Since two Rooks can do a lot of damage together, a safety of a King is an important issue. This, however, does not mean that King should always hide behind pawns, but one needs to be more careful than in single Rook endings. Just as in any ending, it's important to avoid unnecessary pawn moves and avoid making pawn weakness. The strait attack on those pawns, however, can be rebuffed fairly easily. Black is unable to win at the current situation because the opponent's Rooks are located near weak pawns and can easily support either one.