I had disconnects on both our toads to reduce wear on parts of the drive line, even though they weren't required for towing those particular vehicles. I think that is what the OP is talking about. I didn't have any problem installing them myself, but I've been doing my own mechanics most of my life.
We live in Southern Oregon so I can't help with the original question about where to have the work done, sorry.
Best of luck.
Steve
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