Please get the Owners Manual for your TWO WHEEL DRIVE Jeep Cherokee, and read the instructions for Recreational Towing.
I'm not entirely sure, but I don't believe ANY TWO WHEEL DRIVE Jeep is approved for four down towing. I'm pretty sure they are not approved for dolly towing, either! If such IS the case, and you do it anyway, there is a good chance the transmission output shaft bearing will go bad due to lack of lubrication. It may take a while, but it WILL happen eventually!
IMO, the ReadyBrute integrated towbar/braking system is the best there is.
Keep in mind that such a braking system is NOT required by law in many (if not most) states. However, some states (AND the Federal Motor Vehicle Safety Standards) DO have braking performance requirements. For instance, in Montana you must be able to stop any "combination of vehicles" within 40 feet from 20 MPH on a clean, dry, hard, level surface (MCA 61-9-312).
NOTE: That is not to say that auxiliary braking is not a good idea. It is merely stating that such a system is not required by law in many states. Also, keep in mind that, AFAIK, NONE of the available systems have ever been tested by an independent testing laboratory. If they have been, one would think that the results of such testing (if favorable) would be bragged about in advertising. I have never seen such advertising.