Hi Joseph!
Great news on the install--congratulations! Sounds like it was well worth your time, and the bonus is that you know exactly where everything is and that the job is done right!
I saw your earlier post on the purchases--you really got a great deal. Your total cost for your entire tow system is going to be crazy low. The $500+ quoted labor cost for your brake system is probably about right. The labor on my install at Dan's Hitch in Elkhart was $1400--but that was the entire tow system from baseplates, brake system, electrical, lights, and the warning lights in the RV. Also, I know too well about the agility and size issue--as I mentioned earlier, several years ago I absolutely would have done mine, but I've finally reluctantly acknowledged that I can't outrun age.
Let us know how the system works out. Hope your experience proves to be as good as mine has been.
All the best, Mike