R_Lefebvre
Expedition Leader
The 7 pin round could work, it just needs a few improvements. It needs O-ring sealing, from and rear, and it needs a proper latch. Other than that, the actual spade construction seems fine to me.
I am currently using a 6-pin coiled cable (no trailer brakes on my Bantam T3-C yet). It has male connectors on each end that mate to female connectors on the trailer and tow rig. 7-pin versions are available, as well as different color cables (mine is red). Here is a photo that I found by googling "coiled trailer cable." I bought mine at my local trailer supply.
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