I've got a 2010 Expedition 5.4L 4WD with all the bells and whistles including the towing package and class IV hitch. My question is this. How much do you think I can tow safely (short distance) without a trailer brake? Background: A friend is buying a RV trailer locally and just wants it dragged to his house (~20 miles). I don't have the weight yet and I don't know if it has surge brakes. I'm just curious how much it can weigh before towing it is ill-advised. Also, if I need to add a brake controller is it as simple as buying one and plugging it in? Thanks in advance.