Be careful
Rather than looking for lighter boat, I'd think about a bigger truck. Be careful with a boat that is close to the max towing capability of your vehicle. (I assume you meant to type 4,000Lbs, not 40,000) It's easy to put it overweight with an outboard, fuel, supplies for the weekend, etc. Add a slippery ramp and two wheel drive and you'll be quite entertaining at the retrieval ramp. Also, remember displacement is not the same as tare weight on the boat and trailer. Hunter should be able to tell you what the boat actually weighs. Add the weight of the trailer and all of the weight in your vehicle, then you'll have the total load your putting on your brakes. Because, after all, stopping is as much of an issue (if not more) as is starting and pulling.