For the Curt Trailer Hitch Receiver - Custom Fit - Class II - 1-1/4" # C12172, there really isn't a solution other than to use a torque wrench. Without torqing the necessary bolts to the manufacturer specs, you void the warranty and can have safety issues when using the hitch receiver.
If you want to purchase one, I recommend the torque wrench # ALL944001 or the digital adapter # ALL940962. There are many auto parts stores that now rent tools as well if you prefer to go that route, but... view full answer...
The only instructions for wiring harness # 118652 are the basic install instructions that come with it and that I have linked for reference. What I recommend for trim panels are trim panel tools # PT73HJ which will work much better than metal tools like screwdrivers that can potentially damage plastic trim panels. view full answer...
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