These 7-way SPADE cables only have a connector on the end that plugs into the truck connector. The other end is pigtails which connects to your trailer brakes and trailer lights inside a up front electrical junction box. My trailer side connections use the large YELLOW twist on connectors to make the connection...
The only thing you would gain by replacing the long 7-way cable is you can get a new one with the truck side connector molded on but the other end will have to connected much like the way it is now. You can purchase a short version and a long version of this cable from ETRAILER.COM
Maybe your truck camper needs something different than the standard travel trailer setup uses???
Some truck campers need to have an extension setup much like what is shown here. This is mounted inside your truck bed and the other ends routes down and plugs into the standard truck 7-way connector. This allows your Truck Camper 7-way to plugged into the truck more easily done.
Hope this helps...
Roy Ken