xj TROLL

I'm thinking of doing an add a leaf to the rear of my XJ to gain a little support for pulling a boat. I understand nobody knows how big the boat is, but lets just say its an aluminum bass boat. Do you believe this will add enough to make a difference in the rear for pulling it. Also how involved is the project? Fairly simple or should I expect some serious issues? Where is the best place to get a set? Thanks!