I have almost the same toad, except it's older and has a different bed in the back, but the running gear is the same. Yes, it's nice to be able to just put the transfer case in neutral, put the tranny in park, then take the key and lock things up. It doesn't get any easier than that.
I don't think you will have any problems with either the Roadmaster or Blue Ox towbar setups. Check them both out in person and see what you like better. I've had good luck with my Roadmaster Blackhawk II all-terrain tow bar. While I like the idea of the bellows on the Blue Ox, but I preferred the integrated cable guides on the Roadmaster. It makes for a neater installation, no tangled cables, and when you lower the arms to the toad, the required cables are right there where they need to be.
For braking, I would agree with the others so far. I absolutely don't want the toad brakes coming on with the exhaust brake. I've done some long downhill runs, using the exhaust brake for several miles at a time. The toad brakes would be absolutely cooked if they were on that long.
I went with the US Gear Unified Tow Brake. Partly because it works with a vacuum pump so the toad's power brakes are active and it isn't working a dead pedal, partly because everything is hidden and requires no installation each time you hook or unhook, partly because there is the control panel in the cab to monitor operation, make adjustments, and manually control braking, and partly because the coach was already wired for it. It requires power, ground, and a brake signal, and I wired them into the toad's lighting umbilical using a 6 pin plug on the toad end, and the standard 7 pin plug on the coach end. That way, I only have one cable to connect, so there is nothing special to do to hookup the braking system other than to clip on the breakaway switch lanyard. It was a little more work to install it, but the down-the-road convenience was well worth it.
Good luck in your choices, there are a lot of good products out there to choose from.