I looked at the placement of the brake, routing of the tubes and wiring, position of the brake cylinder and decided it was too much for me to install. It took the shop six hours to install the brake in my car. This shop has installed many SMI brakes on many cars and they did a better job than I could have. You can't tell there is a brake except for the ON/OFF switch on the dash board. They did a good job of hiding everything.
I find that some things are best left to the pros.
Since I had cable problems, I have not driven the coach with the brake working. I will have to test it tomorrow to see how it feels with a working brake. Turns out the coach bakes did an OK job of stopping both the coach and the 3200# car.
I expect the brake with take care of the extra weight of the toad just fine. I also like the simple "flip of the switch" to engage and disengage the brake. Connect the break away cable and tow bar and I am good to go.