My blinkers work fine on the truck but when I have my hauler or utility trailer plugged in the right blinker doesn't work on the trailers. Any idea where the fuse would be for this?

 

Not sure about a fuse, but there are seperate relays under the hood for left and right trailer turn sigs. They are side by side. Both go on for brake. Maybe one gave up?

 

There are regular fuses for towing turn signals. On the 00 they are also under the hood, when I bought mine I had to figure it out, mine was left and brakes. Anyway, grab your manual, there is a fuse layout for that underhood block, easy to track down.