Well I would do MIP CVD drivetrain... They are strong as hell.
http://miponline.com/store/E-Revo_Parts.html
They are pricey but in my opinion worth it if you want to put down 6S power.

Robinson Racing Transmission Internals.
Do not use RPM tru-trac set up.. if your using CVD drive shafts... Do the brace thing.. If your gonna just be bashing think hard about removing the wing assembly. Because on a bad landing it is just a ton of leverage on the back bulkhead/chassis.

These are all just my opinions.. It is true you cant make a truck drivetrain unbreakable but this is about as close as I can without putting 1/8 diffs in.. it takes alot of work . Good luck. and have fun.