Find the weight of your boat and the tank capacity on the Internet. Be sure to include the weight of the motor. Multiply fuel tank capacity by 6 lbs per gallon. Add all that up, and then add 10% for all the crap you typically store on the boat. If there is a lot of crap, add 15%. Then add the weight of your trailer. The total of all that will be the gross weight of the whole package, and in your case, that cannot exceed 3500 lbs. If it does exceed 3500 lbs, then you will need to get a bigger tow vehicle, or if it is not too far over 3500 lbs, beef up the suspension and hitch of your Equinox - not only the rear suspension, but also the front suspension. You will also likely to need different, stiffer side-wall tires.
If it does not exceed 3500 lbs, you then need to measure the tongue weight and adjust the boat on the trailer so that tongue weight is no less than 6% or gross weight and no more than 10% of gross weight. Then, after thoroughly testing the trailer brakes, take it for a VERY CAREFUL test drive. You want to make sure the boat doesn't start fishtailing a highway speeds, especially if going down hill. If it does fishtail, you will then need to get a special anti-sway distribution hitch. That can run between $500 to $1000.