I will stand by every thing I said.  WAAS will not do an acceptable job of Row Crop planting.  SF2 and Omnistar HP, will in most cases.

I had the occasion a few weeks ago to spray a field that had been planted with RTK, but using the WAAS signal on the sprayer(RTK Base station was down for a couple of hours).  The rows were RTK straight. Guess rows were perfect.  The tractor was running fine, no "S-ing".  I was having to nudge 4-5 times a pass in quarter mile rows to keep the tractor off the row.  I finally started using the system to find the right row and then drove it manually.  It was more work doing all the nudging than it was to steer.

WAAS performance will vary based on how close you are to a ground station.  If you are very close to a station you may get better performance than most.  But for those of us that are not fortunate enough to be close, WAAS gives stated performance of 1 meter static and 1 foot pass to pass and I have seen worse than that.  Wait will you have a day with bad solar flare activity and WAAS jumps you 30' in about 15 seconds.  I have seen it happen on more than one occasion.

And yes, RTK systems can be moved from vehicle to vehicle.  Each Vehicle will have to have it's own platform kit, but the controller, display, and receiver can be move about as easy as an EZ-500 system.

I do not think it is right to make claims about system performance that will cause people to buy a system that will not meet their needs or expectations.