Tesla Motors Club

We just moved into a new house. The house we just came from I just installed the charger on the side of the house and called it a day. This house is much more complicated. The parking areas for the house are away from the house and the detached garage only has 120v. I am installing 8awg wire and I have tried to tunnel under the driveway with 3 different trenches but each time its a ton of rocks. when they put the driveway in, there must of been on feet of gravel. Add that into a wooded, New England area and it doesn't help. My other solution is to go along the driveway and under a small stream bridge and back up to the parking area...it would be about 200ft, maybe 250. Has anyone done a run that long? The run to the garage is about the same length and has a few obstacles.