I have the towpackage and used this wireless controller. Worked ok as far as electrical controllers go.
CURT 51180 Echo Mobile Electric Trailer Brake Controller with Bluetooth-Enabled Smartphone Connection, Proportional
https://www.amazon.com/dp/B07JQ99SDD..._YuuYDbV5B40N0
I asked the sales person and service department several times and no one ever indicated there was a connector already for a controller under dash. I would very likely have used the wires instead. I'm also very curious to know if it worked for anyone.