Thanks southsound, yea I practice on the munter hitch rappel yesterday, I made a 2 in 1 lanyard for the times I have to climb to set a pull rope and rappel on the munter like you have described.
Makes sense. Do you have any incapacitating insects/ snakes/ etc, in your trees?
Shoot a pull line in when you can. Don't isolate it, rather run the one end down to the base and running bowline above the facecut, knot on the back cut side. A strong branch at the collar should take many/ most reasonable pulls. I spent 5-10 minutes the other day to shoot a pull line in a dead fir. Easier than climbing. No need to move 150-250 pounds of climber up and down a tree, when the throwline/ weight will do the trick sooo many times.
While trying to go quickly up the tree to set a pull line, how many chances do you have of falling to your death, accidently? How many times could you fall to your death, when propelling a 12 oz weight on some throw line?
Throw lines are your friend, that's all I'm getting at.
Keep learning.
Jed posted about a guy who fell and broke his back while rappelling with a munter hitch. His rope slipped, dropping him several feet, at which point he lost control of the rope.
A groundman can give a fireman's belay, that is where the groundman pulls hard down (not the munter locking position!) in the event of a free fall by the rappeller, locking off the munter hitch. Set up the groundie to use a trunk wrap to help the munter if there would be questionable friction, like a very heavy climber.
When we lower things, all else being equal, i like the groundman to set up next to a tree, so he can use a little trunk wrap if there is not enough friction in the system, or to tie off, as needed, if there is no ground-level lowering device (natural crotch, Belay Spool, port-a-wrap in the tree).