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As many know, I have towed my 1989 Outrage 25 over 200,000 miles since the boat was new with Cadillac Fleetwood Broughams factory equipped with a 7000# tow package. I estimate the total rig weight a 6000#

https://www.instagram.com/p/BfZqA5RAd...stonwhaler

(click arrow on photo for more pictures and video)

The keys to doing this are two additional items. First, replacement HD "Cargo Springs" on the car. Second is a weight distributing hitch using "spring bars", readily available at any tow shop. As you can see in the photo, in spite of the 600lb tongue load, the car rides level. The spring bar hitch re-distributes the excess tongue load to both the front wheels of the car and the trailer wheels.

I would look at your owners manual on the truck, and see what they say. I'll bet for a load like you are talking about, 8K to 9K lbs, they will also be recommending a load distributing hitch. On these hitches, the recommend tongue load is actually higher, about 10%, or in your case 800-900LB, which the hitch then distributes. This keeps the boat from fishtailing down the road. A friend has a 2500 Suburban towing a 25 Revenge Whaler Drive with twin 200 Mercs (about a 7000# rig), and even there Chevy recommends a weight distributing hitch.