Sounds more like he was practicing interdiction methods, he may have pegged you as a driving hunter. Also, when they run your license, they will run your plates and vehicle description. There may have been a discrepancy in the DMV file, there may have been open warrants for similar descriptions of person or vehicle. Or he may just be a dick with nothing better to do than chase down an erroneous and harmless trespassing report. And yes, I would report him to the sheriff.
The proper response when facing a plethora of questions is to ask "Am I under arrest, are you going to cite me, or am I free to go?" If he states something along the lines of "I just have a few more questions for you.." then ask him if he has reasonable suspicion that you are involved in criminal activity; necessary for conducting a terry stop. Even in a terry stop, you have the right to shut up, and if he does not have probable cause for arrest (an refusing to cooperate is not probable cause) then he has to let you go. If he continues to pester you, make sure to get his badge number, name, and department; he is required by law to disclose that information. I am not guaranteeing it will go down like that, but if the officer has any sense of self preservation, he knows that if he continues to hound you, he is venturing into lawsuit territory.
http://en.wikipedia.org/wiki/Terry_stopBTW, most deputies have only the training afforded to them at the academy. You say the words reasonable suspicion or terry stop and he will likely back off immediately, thinking you are an attorney or something similar.