I'm getting ready to take my first trip on the 16th. I have a Kia Soul to tow behind my 98 Dolphin. After reading various posts, I decided to buy a Break Buddy Classic, intending to install it myself...
Ok, I called for you. The tec rep from Brake Buddy said the Brake Buddy can be used dolly towing. Just boost the psi by 10psi over the car weight to account for the dolly.
But you still need a active power source to the battery to run it.