I have a few TR89 machines spotted for maybe replacing my TR86. One of them the owner ran a 25' 973 on soybeans and a 6 row 974 in corn. I'm running a 20' and a 6 row corn head as well. I spoke to several friends I know with TR98's and they both use 20' platforms and 6 row corn heads. But they say they need to go 5 to 5.5 MPH in corn to keep the machine full enough to work well, even in 200 bushel corn. And about 4 to 4.5 in soybeans. I run about 4 at the max in corn and about 3.6 or so in soybeans. My platform won't cut it at speeds faster than that. What is the ideal size platform for a TR89 or TR97 or 98?