3/4 ton truck for sure, if you're going to buy one. My 24' Chris Craft weighed in loaded at about 7500 lbs with the trailer, and my Ram 2500 was the right rig for the job.
If you're only towing a couple of times a year, sell the trailer and hire a transporter to do it for you. I just had my 9,500 lb. Carver hauled from a launch ramp about 10 miles away, to my driveway. For $170. he picked up the boat, brought it to my house and blocked it in my driveway. I didn't have to do anything but drive the boat to the ramp. 22 cement blocks at $1.50 each and about $30.00 worth of 2x boards, all reusable next year (and the years after that).
No trailer maintenance, repair and annual registration fees. And no more hassle of towing, launching and retrieving a heavy boat.
My .02