2023 Bennington 20 SLM, Miller Marine is the worlds largest Bennington pontoon and tritoon dealer! Disclaimer: Production photos from the manufacturer are displayed. Photos from Miller Marine to come. Max HP: 70-140 HP Overall Length: 20 ft. 11.5 in. Deck Length: 19 ft. 6 in. Deck Width: 8 ft. 6 in. Weight: 1781-2104 lb. Capacity: 8-11 Persons Fuel Capacity: 21.4 gal.