Try a ReadyBrute / Ready Brake tow bar and aux braking. Rated for 10k. My Wrangler weighs in at roughly 4500lbs, with fluids. The brackets, receivers and wire harness are easy to come by. I did my whole setup myself for under $1400 and a day of DIY labor.
Rick and Julia
2005 Dolphin 5376, W24, Solid Body Paint, Koni FSD's
2007 Wrangler Unlimited....it follows us everywhere.