It looks like your 2018 Jayco Redhawk 29xk was built on a E-450 cab and chassis. The Tekonsha Plug-In Wiring Adapter item # 22292 will plug into a port behind the instrument cluster finish panel in the center of the dash on the driver's side. I have attached some pictures below that will help you find it. You will be looking for a grey connector that has to be unplugged to expose the factory plug you need.
If it's not located there then your chassis may be an older one and you would need... view full answer...
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