I can relate to what you are saying. In doing my stem to stern, top to bottom inspection this spring, I found that the hard grommet that would have isolated the brake wire from the brake backing plate was never installed. The grommet was just left hanging on the wire and the wire was routed through the on the metal backing plate. It was kind of a bugger to get worked into position on the backing plate. Would have been your issue waiting to happen.
At that same time, I made a proactive repair. I added a fair amount of the split corrugated plastic wire loom to many wires that not only were unprotected, but went over and around frame gussets, sheet metal and what eventually would wear through the wire insulation and short out. There was a lot of hasty work at FR done securing, routing and protecting the wiring. No harm, no foul... a few bucks worth of tubing, tie wraps and a few hours of effort probably saved me grief down the road
2016 Flagstaff 27VRL Emerald
2014 GMC 2500HD CC 4X4 6.0L