In regards to pieguy's question about steering...majortoms answer is OK. (sometimes)!!!
The problem comes on grass fields like I fly from. I posted a question about this before I converted to the taildragger and I received about 50/50 yes you do, and no you don't need a steerable tail wheel. Not only is it harder to turn with just a skid or a "castoring" tailwheel on grass..... add to that the smaller surface area of a trainer's rudder compared to an aerobatic low wing plane and it makes it very hard to turn by just the prop wash accross the small rudder surface. I think the Sullivan wheel is very good and much easier to install than running a control rod. The problem with most trainers is the configuration of the tail feathers does not allow for an installation of the Sullivan wheel. Again, majortom is right on if the plane has good power and a fairly large rudder. I have seen several guys at our grass field with just a skid have no problems. lownslo..

Bob