We have the exact set up your shop recommended, but on our 2015 Jeep Wrangler Unlimited. I was able to install all of the components myself with little to no drama.
This brake system works fine. One year down the road, it is still working as designed.
I have often wondered how people fine tune the sensitivity on their brake system. I occasionally hook the Jeep up to our Chevy Suburban and tweak / tune the SMI Stay n Play sensitivity until I no longer feel the jeep pushing me from behind when stopping. I can also see if the hood is dipping too much and feel if the Jeep is "tugging" the Suburban to a stop due to over braking. That's not possible with a big RV.
If you don't have a large SUV to do this with, see if a buddy can give you a hand. It only takes about 30 minutes (including hooking up) to get the SMI dialed in perfectly.
There's my $0.02