A contract tow guy for Good Sam assured me that they will NOT dispatch off of paved roads. He implied this is industry standard.
Otherwise I have been happy with them for two tire incidents. Would like to know about others though.
Because I am usually off-pavement I have put together a complete tire recovery kit described here
http://www.rv.net/forum/index.cfm/fuseaction/thread/tid/28538464/gotomsg/28561886.cfm#28561886Latest addition is a Made in USA "Safety Seal" plug kit.
I learned the expensive way that a single stone can wedge between duals and destroy both tires. This cost me $350 and nearly rendered my RV immobile on a mountain road many miles from pavement. Since then I have modified my travel logistics to stay on "Improved dirt" which have less loose stones larger than gravel.