Its not just the ACE, but you will find a braking system a must for most all RV's towing a vehicle, whether it is on a dolly or 4 down with a tow bar. I believe most states require a braking system of some sort on a towable. Several dolly's have electric or surge brakes available. Your main concern should be, to be sure your Durango is a towable vehicle, 2 down or 4 down and total maximum weight the ACE will handle. You can add a portable braking system inside the Durango also if you want to use a tow bar.
Larry, Randa, and Toby the Border Collie
2014 Thor A.C.E. 30.1 Ford V10
2016 Jeep Wrangler Unlimited Toad w/ Blue Ox connections, SMI Duo Braking