Suppressors Thunder Beast group buy

I am pulling the trigger on a TBAC. I just need help with experienced guys to pick the right can for my applications. I have an unthreaded 20" 308 AIAT with LW barrel, a AAC 16" 300 BLK (Carbine), a DPMS Oracle 308 with 16" barrel that I would like to run it on. Precision/accuracy is my first goal. I plan on sending my AI LW barrel to get threaded. Where should I have it threaded? My local gunsmith does lots of customs but not sure if he will want to deal with the LW barrel. I hear some places won't mess with LW barrels because of the metal hardness... I bought it from Mile High so I may send it there. Can someone point me in the best direction for choosing a TBAC and having my barrel threaded??
I don't even know where to start with paperwork and forms. I am thinking about getting a trust. What are the pros and cons of the trust?