I?ve come across this online, it?s mainly focussed on slack lining, but may be of interest to some.

https://76cbaa5c-cbc2-41e7-9222-3716b5892c31.filesusr.com/ugd/c990e4_80b25da2394d4359b8e8e986eabba075.pdf

Good to know i break many of their Bolting Commandments, as well as the normal ones! 

I've taken a few highliners caving and they though our resin bolts were sketchy because there were only two and they are only 16mm. The forces involved in a tensioned Highline are insane, the load angles are by the nature of the sport the exact opposite of what we aim for and they like to have completely redundant backups are lines do snap on occasion hence why their stuff may look overkill to us.

The main writer of the bolting Bible has a good YouTube channel called How Not to Highline where he breaks stuff including bolts.