http://www.trialstrainingcenter.com/index.html
not sure, they let you tear up the trail on bikes with seats, but you can give Cat a call and ask her
they have dirt bikes for rent, so I never thought about them not letting dirt bikes ride on the property - just now I noticed their page does not mention anything but trials and dual sports

when are back from home, we will take our bikes-without-a-seat and roam their 650ac property on the tracks of yesterdays Trials World Round
anyone want to join us?
July 1/2 or July 8/9