There are several circuits to the trailer connector. Each has its individual circuit protection. I don't think you will find a fuse that covers them all!
I suspect you have something disconnected somewhere. On my 2003 W20 there is a connector on the right frame rail near the steps. From that connector forward is Workhorse. From there back is coach builder. Perhaps that connector has come disconnected. I had one open circuit in the coach builder part of that. I just crawled under the back and traced the wire bundle until I found it.
You might have to do the same.
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2003 34' Georgetown on W20 Workhorse Chassis. UltraRV power mods. Doug Thorley Headers and MagnaFlow 12589 mufflers. Front Sumo Springs, Rear P32 Sumo Springs, UltraRV Track Bar.
1998 Jeep Toad.
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