For braking on our 2018 Silverado or our 2016 Traverse, we use a Roadmaster 9700. Nothing permanent on the floor. Simple power wire and brake actuation wire and that's all. Have been using it since Fall of 2015 and it works great. Sent in last Winter to have the software updated and everything checked out. Came back looking like a brand new unit.
Highly recommend. And that 2018 Silverado is loaded, more like a box trailer than a pickup.
Ric and Jan Golding
2016 Jayco Seneca 37FS
2016 Chevrolet Traverse
2018 Cheverolet Silverado