Re: Would you tow this with this?
There are no modifications you can make that will increase your towing capacity. A larger engine or taller gears can make it easier, and 4-wheel disc brakes will make it stop better, but the frame is only designed for a particular load so you are putting yourself and others at risk.
When you combine the fact that the boat probably weighs more than the Jeep with the short wheelbase, you've got a recipe for disaster. If you're smart about it, you can be safe towing this way, but it is by no means a safe thing to do.
Also, I can't tell from the pics if you have a hitch or an aftermarket bumper with a receiver, but if it's the aftermarket bumper check with the manufacturer about it's ability to be used for towing. Most aftermarket bumpers include the receiver for offroad recovery only and they are not rated for towing.
I currently have two Wranglers (a TJ and a YJ) the older of which is heavily modified and never touches the street. Having fabricated the suspension and done extensive work on the frame, I can tell you from first-hand experience that it's not designed for towing and the 2000lb rating that they give the Wranglers is optimistic at best.