IF U HAUL USED A T CONNECTOR MAY HAVE BAD CONNECTION
You have a grounding problem at the trailer. The white wire is the ground on trailer wiring. The taillights are brown, the signals and stops are yellow and green. Sometimes the white wire will loose its continuity with the truck, causing the lights to black out. It could also be a wiring issue with the trailer itself, but most likely its the ground giving you feedback and causing the blackout. run a wire from the ground contact on your plug back to a spot on the tongue and secure the end of the wire to the trailer at that point. Do not rely on the contact of the trailer with the ball hitch to establish a ground.
You need to read the owners manual! The Toyota manual states the Prius is not designed to pull a trailer.
The dolly tow bar may fly up, possibly causing injury, and making it very difficult to re-couple.
The dolly tow bar may fly up, possibly causing injury, and making it very difficult to re-couple.
The dolly tow bar may fly up, possibly causing injury, and making it very difficult to re-couple.
The dolly tow bar may fly up, possibly causing injury, and making it very difficult to re-couple.
The dolly tow bar may fly up, possibly causing injury, and making it very difficult to re-couple.
The dolly tow bar may fly up, possibly causing injury, and making it very difficult to re-couple.
The dolly tow bar may fly up, possibly causing injury, and making it very difficult to re-couple.
Put a dog under there.
On my 1999 Explorer it is fuse #30 labelled "Park Lamp/Trailer Tow Relay" in the passenger compartment fuse panel Page 183 of Owners Guide
I have the 2004 brochure in front of me. It lists total pkg. weight (approx.) 2,466 lb. That would be with the 115 HP Mercury.