I will be towing a trailer with a newer round 6 pin connector, but my truck only has a 4 pin connector. What stores carry an adapter for this? I would order one online but it would take too long.
Checker auto has those adapters you are wondering about. Certain parts of the country they use different names
I would upgrade to the six pin connector that your trailer has. My guess is that the trailer has brakes on it, and they wont work with a four pin connector, or without a brake controller.
Many truck accessory places have the required wiring you seek. Look up in your yellow pages where they usually sell pick up truck tops. They sell all kinds of towing parts.
go to a trailer parts store or an rv dealer