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Does a 7-Way Need to be Installed on a Second Trailer When Double Towing  


In Kansas when we double tow such as a toy hauler and utility trailer the law says the second trailer has to have brakes on one axel. Right now my trailer dont have brakes but my question is to put breaks on the trailer we have to have a 7 pole plug right? Also how can I wire the back of my toy hauler for a seven pole hitch connection. Personally I think the law is crazy cause I have brakes on the 5th wheel and not many small utility trailers have brakes. If you have a solution or advice Id love to hear back from you


Expert Reply:

Technically you don't "have" to have a 7-Way, but if you will be towing your utility trailer with your tow vehicle only sometimes then a 7-Way is the best way to go. Using the Epicord 7-Way Molded Trailer Plug with Junction Box # 277-000141 is an option to do this.

The junction box is labeled on the inside which makes your wiring much easier. If you are only wanting to add the braking function then you will need a minimum of 10 Gauge Wire # 10-1-1 to run from the junction box to your brakes.

On your toy hauler side of things you will need to add a 7-Way with the end that you typically would see on a vehicle. The Hopkins Mounting Bracket and Wiring # HM40975-11998 is a universal application and comes with both a 7-Way and 4-Way connector for multiple applications. I attached a picture showing which functions on your toy hauler need to be connected to which wires on the 7-Way.

Please note that we do not recommend double towing as it is much more unpredictable and dangerous. The wiring itself could be an issue. You will need to make sure that the fuses in your tow vehicle can handle the amp draw for all of your trailer lights and the trailer brakes. The wiring will also need to be a thick enough gauge that they don't overheat and melt.

You also need to make sure that both your tow vehicle and toy hauler are rated for the added weight of the utility trailer, and that you are within the towing lengths of the law.

expert reply by:
Jon G
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