There are two ways to collect topo data depending on how you want to use the data. One is to dig out the following type of files:

 Track3D_31May09_1233.shp Track3D_31May09_1233.shx Track3D_31May09_1233.dbf

These files can then be brought into a capable GIS. Also be aware that everytime you close the field out (within an event) you get another set of these which means you need to "append" them together for a whole field picture. These files initial purpose were probably for diagnostics but have proved very usefull for other things but unfortunately the need to "append" is the downside unless you do it all in one session.

Second you can use the MultiPlane add in (no unlock fee) you refered to as another way to collect the data. That requires you to do a border, benchmarks, interior, etc., and to use Multiplane to get the data out. But by doing that you can impose a design onto a field and then write back a file to control the scraper in the vertical. The good thing is you can economically use it with your existing RTK AutoPilot equipment with some vertical control componets you need to add (and unlock). The bad thing is it is limited to the old laser plane light concepts as say opposed to Vertical Curve Technology by AGPS that RTK makes possible. RTK is multi dimensional while dual slope lasers are bi dimensional which evolved from single plane lasers that really are just the net vector of two slopes.

ANYWAY RTK used for water management will actually create more revenue to agriculture than steering once people figure out that many times water's play on the topographic landscape effects yield variability more often than other things.

Arnie