Does it look like this one?mine came from factory with 6wire. I called Bunkhouse and they said I should be able to find flat 6 everywhere. So far I have not found one.
Does it look like this one?
I'd be tempted to remove the 6 way flat connector and replace it with the 6 way round.
Or accessoriesI have an Aspen Classic and it has a 6 pin round that is very easy to find anywhere trailer parts are sold and in most big box stores (don't ask me how I know) It should be very easy to change both ends of the plugs. The sixth wire is for the brakes if you have them.
Most of the campers I know and run with all use the square NAPA connector with 6 pins, and if needed use the extra one for a light or to charge an aux, battery. Looks like the one pictured in Zippos postI am havingtrouble finding a 6 flat wiring harness to hook trailer to motorcycle, any help? I have checked camping trailer stores and automotive stores, no luck. Suggestions?