I would definitely disagree on it being enough... If you're only going a few miles or so on the highway while taking it very, very slow, with a flat drive the entire time, a country mile to slow down or stop in and a decent ramp/launch then I think you'll be "ok". That being said, I definitely think you will be over the 7,200lbs with your current setup. Your boat on the GW website says it weighs 4,050lbs dry, which means without the engines, fuel or anything else. But more importantly is that in their "Performance Data" section for your boat with your motor it says the weight of the boat as tested to get all of their fuel economy numbers was at "6,040lbs. (including persons, fuel, water, gear, engines & accessories)". And I'm assuming that to get the best fuel economy numbers possible that they likely didn't have a full tank of fuel or have the boat loaded down with weight, accessories or other gear.
I'm assuming you have a single 300 Yamaha on the boat? That's 600lbs right there and probably at least another 1,000lbs for your trailer weight, if not more. That's almost 6,000lbs and without fuel, of which a GW 235 Freedom has a standard 115 gallon fuel tank and a gallon of fuel is 6.3lbs/gallon. Which will add yet another 725lbs to the weight of the boat before fishing, safety gear or anything else. I'd be willing to bet that your boat on the trailer fully loaded with fuel and moderately loaded with other items will very much be over your 7,200lb maximum towing capacity. On a straight, level, dry road where you aren't driving very far and you have a country mile to slow down or stop in optimal driving conditions is one thing. But if not, that's when it starts getting a little dicey.