We have both the Gk19 and the GK39 Roketa. The torque is not tremendous, but we regularly haul two large adults up and down hills without any problems.
Yes, although how deeply off road and the trail difficulty does depend upon the vehicle's ground clearance, AWD gearing, and driver ability. Any vehicle is capable of doing light gravel roads, but...
It all depends on how much experience you have and how you plan to ride. If you want somthing that is reliable and fast then get a honda crf 450. If you are a beginner than stay away from the bigger...
It depends on if the private road is an access road or not. If the private road is not an access road simply place no trespassing signs up. If you're required by law to allow access to another...