Maybe you could add an extra battery and battery box, and it will help you stay out longer without electric hookups.
You should check your tongue weight with your rig in various conditions (full water, empty water) to see where you're at. Also weigh the TT. If you already have at least 10% of the trailer's total weight on the hitch, you should be ok.
Adding a friction sway bar or a sway control hitch to a rig that's too light on the hitch is like putting a band-aid over an infected wound. Always fix the problem first, and use the anti-sway device for extra assurance. To do that you must know your actual weights.
