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Be careful with tri axle trailers. When you turn they prefer to track straight. Axles work against each on a turn. I would say 3/4 ton the minimum truck for towing. Tongue weight is how the load is distributed. At a minimum 2 to 3 hundred lbs. on tongue so if you hit a bump your rear axle does not pick up. You also do not want too much tongue weight where you front end raises and you lose road feel/steering. Also remember it is not only towing but stopping. 9000lb on three axles quite a push. Kinda need to attach to the hitch and see what you have. You may have to reconfigure where the boat sits a little.