We have an adapter to go from a 7-Way round pin on a tow vehicle to a 7-Way blade style on a trailer. You could use the # HM47425. But the length is not close to 4 or 5 feet.
What you could do is make an adapter. You would need 3 main parts: 7-Way round trailer side, # PK11702, 7-Way blade vehicle end, # PK12-707E, and 4 or 5 feet of jacketed 7-Wire, # DW04914-1. Just change the quantity on the wire page to the amount of feet you want. view full answer...