I use the Blue Ox Aventa II tow bar and highly recommend it. I've towed over 40K miles with it trouble free. As with everything you need to do maintenance, If you like Blue Ox offers to service the tow bar at several of the larger rallies.
I've not used the Currie base plate since it will not fit my 10A bumper. I have read that you sometimes need to do a little filing on the tow bar tabs to make them fit due to it being a little tight. Other than that I've seen nothing but good reviews.
Is your coach gas or a diesel pusher?
I'm not a fan of the brake in a box at all. I've seen too many reports of problems with them. If your using a gas coach then the ready brake is a very popular choice. It's a simple mechanical device that really can't go wrong and requires no electrical power or wiring. A lot of people use the brake in a box units, but I hear of many hanging up and causing brake damage of substantial cost. The brake Buddy brand in particular is on the bottom step of desirability due to this problem. There are several other box type alternatives with better reputation.
If you are running a diesel pusher with air brakes then the M&G Braking System is the "ONLY" unit I suggest. It's easy to install, easy to hook/unhook in less than a minute, works proportionally and seamlessly with nothing to install or remove at hook-up. I've had the M&G on three towed vehicles now with zero problems, great performance and truly satisfied. It is a small air cylinder which goes between the brake booster and master cylinder hard mounted with a two piece shaft. When the vehicle is in normal use the brakes work normally. When connected to the MH the air supplied from the coach brake application moves a bladder in the cylinder which moves the forward half of the pushrod to apply the master cylinder and brake independent of the jeep's pedal or power booster and in direct proportion with the coach.
I used the SMI Air Force One system on my 2011 Grand Cherokee due to the fact the M&G will not fit that vehicle. It worked well and was seamless but I much prefer the M&G over it for several mechanical reasons.
'13 JKUR 10th Anniversary
Billet, Red int., auto, 4:10, Towed behind motorhome
'12 Ram 2500 Laramie, Cummins H.O.
'09 Dodge Charger Daytona, 1 of 400
Several Antique and pro-tour cars