While I see your point, according to the ARB site you don't need expertise to install one. I don't want to have to take a day from work and drive a hundred miles and pay a premium shop that may not even have a lift that can handle a deuce.@Montaillou. I'd look for a shop that has experience with installing a ARB in a Rockwell 2.5 Ton. They are popular in the 4x4 off road community. Having to "see" the locker, doesn't inspire much confidence...........but theres always beginners luck.
Motor Trucks mostly work on 18 wheelers, buses, ambulances, etc. I sent an e-mail to the nearest 4x4 shop to me (60 miles away) and they haven't even had the courtesy to respond.