We pull a DMI 45'Crumbler behind a 43.5' DMI field cult. and it makes a smooth planting bed. Baseball sized rock get pushed down flush with the ground. I also built a rock guard at works with the air reel. It is made of 2 peices of round tubing. One is a larger dia.(1-1_4" x 8" I think) and it slides over the smaller(1" I think). They overlap about 3". This allows the head to flex anyway it needs to. Flaten out 1 end of each pipe and drill a 3_8"s hole off center in it. If you want the guard to be raised, turn the pipes over. I made l brackets the hold the pipes up around 3". The l brackets are held to the back of the cutter bar with the bolts that hold the skid plates(Replace factory with longer bolts). This allows air to pass over and under the guard to blow in loose beans. lastly, paint all rock guard parts Allis-Chalmers Orange and go to the field. These 2 thinks should allow us to run with the SCH up side down and still leave it tipped down. Hopefully we can get by with this as it sure is doing a great job.