So it sounds like you are looking for a converter for your motorhome's separate turn and brake lights to work in conjunction with the combined wiring of your towed vehicle. We do have that, as what you will need is a 3-to-2 converter:
- Roadmaster Brite-Lite Wiring Converter # RM-732
I have added links below to an installation video and review for you to take a look at as well. view full answer...