Ditto on the Prodigy. I wouldn't get anything but a good proportional controller.
Here's the one I use...it works great. You can probably shop for pricing but either this or the P3 would be a good choice
https://www.amazon.com/Tekonsha-9088...s-light&sr=8-2
For the harness you should be able to find something like this. You'll need to verify one specific to your vehicle. Found this one at Camping World
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Jeff & Sandi (and Teddy - 7lb Schnorkie)
2018 Montana High Country 305RL
2015 RAM 3500 Crew Cab 4x4 DRW
Demco Recon Hitch on RAM Puck Ball