Go get the boat weighed. My 2016 craz and trailer was just under 7k lbs on a CAT scale. I dont think the weights in the advertising material account for many options on the boat.
Secondly, look at the loading sticker by the drivers side door for your car, that will tell you the true amount you can haul. You are more than likely overloaded with just the boat. Add people or gear, you are almost certainly overloaded.