Yes, there is an exterior connector for the trailer wiring harness. Tekonsha has a Wiring Harness for your 2017 Cadillac XT5, part # 118720, that will provide a 4-way trailer connector for you.
If you already have a trailer hitch installed, like part # e62AR, the connection that you will be looking for is just up and to the driver's side of your 2017 Cadillac XT5. Just connect the wiring harness that I mentioned earlier and you are good to go!
I linked installation videos of the trailer... view full answer...
From what I've been able to determine from my research, all of the 2017 Cadillac XT5 have the plug that is used to connect a trailer wiring harness, so the Tekonsha # 118720 should work for you. If for some reason the plug has been removed, you would need to hard-wire in a harness like the Curt # C58044, but this is extremely unlikely. view full answer...
The Loading Ramp for Swagman Skaha and Escapee Bike Racks # S59SR is only going to work with the Swagman Skaha and Escapee bike racks and will not work with your E-Spec bike rack.
Instead, you're going to want to check out the Swagman Ramp and Bridge for Swagman Current, E-Spec, and G10 Bike Racks # S32YR which is going to work with your E-Spec. view full answer...
The hitch I recommend for your 2017 Cadillac XT5 is the etrailer Trailer Hitch Receiver item # e62AR. The crosstube is concealed behind your rear bumper with only the receiver tube showing. I have linked an installation video below so you can see the installation property and what the final product will look like.
You will also need the Tekonsha T-One Vehicle Wiring Harness item # 118720 for a 4-flat or the Tekonsha T-One Vehicle Wiring Harness item # 118276 for a 7-way. These are both... view full answer...