No help with where to go close to you.
Removal of the AFO should not be too difficult. If I remember correctly, there is a check valve in the line to the power brake assist diaphragm that you should probably replace with a straight through fitting.
As for the brackets, when I had mine installed on my Jeep Liberty, I used a body shop. Since some of the panels on the front of the Jeep had to be removed I figured that this was body work and I wanted a body shop doing that type of work on my vehicle. Also, the labor rate was less than the RV shop. If I wanted the brackets removed, I would probably go back to the same body shop.
On my Jeep, I had the brackets put on by the body shop and then towed the Jeep to Evansville, IN, where I had SMI put the AFO on both the coach and the Jeep.
Pete - Full Timing
2000 Country Coach Magna 40', CAT C10, #5892
2006 Jeep Liberty