Towing without a car braking system??

So we put 3000miles on our RV towing a 1976 MG Midget. Was only 1750 lbs so no aux brake. The weight was like having 6.or 8 people in the RV, a full water tank and all our groceries!! The MG broke away in Florida at 10 MPH (poor welding of the tow bracket) so we sold it.
We now have a Dodge Dakota, 4000 lbs, so for safety (for you and us) we got a Blue Ox Brake system. I havn't used it yet but Blue Ox says the Dodge will never pass me driving down the interstate and thats comforting to know!!!