In some states, including California, anything above 1500 lbs requires on-board active braking of some sort, controlled by the tow vehicle. That includes trailers as well as towed automobiles. That is for active towing. The other half of the equation is what happens if and when your toad breaks away from the tow vehicle (your 31FK). It happens, and it's always unexpected. Many states also require that toad to have a braking system which will BECOME active if and when the toad were to break free of the tow vehicle. That can't happen any other way than to have an auxiliary braking system which can be applied when all cables, wires, or hydraulic lines are torn free. There are many systems available, both new and used, and they usually work pretty well. Some require more modification of the toad than others. Some keep the driver notified of system status while moving. Pretty much all of them are active for normal braking assist, and become self-active in the event of a breakaway. There are some circumstances where your insurance company won't pay for any damage, injury, or death associated with a breakaway, if you haven't taken steps to install, use, and maintain such a system. I wouldn't tow without one. It's far more than braking assist for the added load, or what condition your tow vehicle brakes are currently in.
2006 Jayco Seneca 34SS
2006 Jeep Wrangler Unlimited Rubicon Toad