A spare LP Nylon spool filled with either 400lb test momoi or 500lb test Momoi...... each approximately 200 to 250 yards.
The heavy mono is preferred by most crews pulling expensive dredge teasers and most professional crews have spare spools ready to change when needed during a tournament.
Another option that has gained in popularity is 500lb or 800lb hollow core braid. Very high strength and very abrasion resistant, supple, easy on the hands, long lasting and no memory. Available in blue only.