Cooper-I don't want to get your thread off topic but you talking about the r/c car track got me going for a trip down memory lane. Here is a track I built behind my house in about 1995. We formed a club and started having races once a month with 25-30 trucks coming every race. We would also have about 10 trucks every weekend to practice and play.
http://i305.photobucket.com/albums/n...ps6fdbd471.jpg
http://i305.photobucket.com/albums/n...psaec12898.jpg
http://i305.photobucket.com/albums/n...ps2966b541.jpg
http://i305.photobucket.com/albums/n...ps4b071d51.jpg
If your track is close to this size you will need more than the D11 to maintain it. I used a cub cadet pulling a section harrow and a railroad cross-tie for leveling and a tiller to re-mix the dirt about once a month. It was fun but it was almost a full time job to keep the track in good shape. I would do it all again though because of the good memories.