Hayshacker. The best thing you can do is go talk to them. Ask them, tell them what you are planing on doing. And if they say no, ask them if they would like to set up times to ride on it. Like say maybe you make a deal with them, you can build the track but only ride on it from 11 in the morning till 6 at night etc..
there is always plan b but i dont recommend it. (this is the plan i used) I asked the people around me they said no but i went and built the track anyways. i ride it from sun rise to sun set. I get the cops called on me all the time know, but they cant do nothing to me since im on my property.