The challenge is not finding parts. The challenge is finding ALL the parts then finding someone you have confidence in that can talk you through a problem when it rises.
The conversion itself is not difficult if you have all the parts to complete the job. But, it does take some time. If a shop is going to charge you 10 hours @$100 per hr. then you should expect
the job to take you 12-15 hrs.
Divide the job up into 3 days. Day 1, mount & wire the actuator. Day 2, install the hub/rotot assemblies. Day 3, install the brake lines. Don't hurry, take your time.
As a full time retired RV'er whose only job is to assist in disc brake conversions, I can assure you that I supply a complete kit and make myself available to walk you through any issues.
I do not sell, tow bars, refrigerators or toilet paper. Only disc brake systems.
I do seminars at "The Rally", The Escapade, Air Stream Int'l Rally and many RV shows including Quartzsite, Pomona, Denver, Dallas, Austin and many others.