If it's just a connection problem, maybe just try a wire brush to clean things up a bit. If your using a 7 round - 5 flat adapter, then the connections inside the adapter can get messed up too. Probably just need to replace it then.
If driving a late model GM truck & using the typical 7 round - 4 flat adapter, you need the 5 flat plug to get the trailer brakes enabled/disabled when in reverse, or you have to get out & connect pin 4 to something hot (pin 2 by the ground) & that should disable your brakes. Just be sure to get it reconnected correctly once you are going forward again.
Trax pad is on it's way to you as we speak.... USPS should email you with any status as it goes on it's way.