Our 2619 had the water tank located under the driver-side dinette seat, which was located in front of the axle. One way to add tongue weight is to carry water (8#/gal). The advantage of the extra tongue weight far outweighs the disadvantage that extra weight has on mpg. Our current trailer has a 50 gallon water tank under the front-mounted queen bed. It is always full when we leave home.
I don't know where the water tank is located on the 2720SD, but if it is in front of the axle, try filling it at home and experiment with your towing stability.
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