Me too bought last week...see photo.
I have 3 estimates thus far using Blue Ox baseplate, Avail towbar and STAY N PLAY brake system. Also charge line to battery.
Quotes are 5568, 5303 and 4907.
There was another quote for 5262 using RVI portable brake system.
So far I prefer the STAY N PLAY as breaking is proportional to the brake application on the ACE 29G MH.
Blue Ox site has dealer locator and I used that to find these installers.
I have same concerns and the 2 highest quotes are from installers who do these all the time.
I visited one and plan to visit the other on Monday.