I have lost both turn signals and brake lights.  Everything was working fine the last time I used the unit, but when I did a safety check before I drove off, none of these worked. 

The tail lights (on a separate circuit) works properly.

I've check the bulbs, there fine.  I check the fuses under the dashboard and they're all good.  I am planning to get a new relay (mounted under-dash) today, if there is no way to test them.  

Note that this is without a toad attached.  My RV is a 2001 Discovery 38D.  

I'm wondering if there are additional fuses somewhere in-line.  I haven't found any such creatures.  If anyone knows if there are additional fuses somewhere, or has any other advice or suggestions I'd be most grateful for your response!