2025 Forest River 3990FL

Forest River Sierra 3990FL stands out with five slideouts and a generous 522 inches of body length, creating expansive interior space. This model accommodates up to eight people for sleeping, blending practical comfort with a robust design. The combination of a dry weight of 12,439 pounds and a GVWR of 15,375 pounds highlights a strong, well-proportioned towable layout.Inside, you’ll find premium build quality and thoughtful layout that maximize usable living area. The hitch weight is 2,825 pounds, supporting confident hitch performance, while the total black water tank capacity is 50 gallons ...