I looked into this a couple of years ago and IIRC, the local shop that did a ton of custom lines said that their products are "technically" for racing applications only.

Supposedly on regular vehicles, brake systems are something that need to be DOT approved. If not, and you're in an accident because that line gave, or contributed in any way to the accident, then guess who's likely to get reamed? Also, there is a possibility that insurance won't cover you because you've modified your truck with "unsafe/unproven" brake components.

I would imagine the burden of proof will shift to you to proove your modification was safe and didn't cause the accident.