I think you should be "OK", but you should double check your weights. And, really, this is something you should do yourself - don't rely on what someone else says. Go to Grady's website and you can download the owner's manual or brochure for your boat or model year. That's going to be your "dry" weight - so add your motor, batteries, gas, etc, etc. Also add the weight of the trailer - which can typically be found on the VIN plate, but sometimes that is hard to read. In that case, figure about 900-1,100 pounds.
However, this is more about can your vehicle STOP the rig, than pull it. Especially since you have no "breakers" (I assume you mean "brakes"?). If you're just going on back roads, just be extra cautious and don't let your speed get away from you.