Thanks for info dude! Where I have the R10 adapter I read that it only takes about 3inches of drivetrain lift to get it flat. I'm going to run a UHMW skid off the side of my F.R.O.R. style mount so aslong as the bottom of it is an inch of so I'd be happy.
Just glad that I don't need to worry about the floor caving in without having the tunnel inplace.