So what I'm hearing in this thread is that a larsen truss would not provide enough lateral stability?
There are plenty of examples of this techique being used on TFs.
If a TF can not support itself and stand the test of time, it's a mere accent.
The two stucture redundancy was discussed a little while ago here:
http://www.tfguild.org/forums/ubbthreads.php?ubb=showflat&Number=18184#Post18184