I understand most section line right of ways are 66' wide or 33' from each side of the centerline. can a fence be ran in the very center? assuming there is no improved/country road present, just a trail.
IF so, one could drive their vehicle within 33' of either side of the fence?
Absolutely fences can run in the center of the section line. Then of course you need to decide which side you want to drive on. I'll refer to my previous suggestion. Unless you really need to drive down what you think is a legal section line, make sure you are doing everything correctly. It's rare, but there are spots in ND where counties have abandoned section lines. Which means they are no longer useable by the general public. Not common but possible.
Section lines run straight N/S or E/W, never have known what exactly is legal when you come to an impassable area and need to go outside the right of way. Then again if you have a favorite spot to get to, consider walking to it on the section line. Making a trail opens it up to other hunters. Hunting might stay better if you're the only one willing to walk in. For me life is better if I try not to create undue problems just to prove a point.
Lastly, in the National Grassland areas of western ND, just because there's a fence does not mean that fence in on a section line. Many of those fences were built years ago and generally follow the easiest terrain. I know of one area where a fence runs for more than 2 miles in a straight line. According to the map, one side looks like public land the other private. Well, that's kind of close but in actuality the fence runs about 200 yds on public land. The other side is private except for about the first 200 yd Why? I have no idea but it does. GPS can be very valuable in such areas where there is a mix of public and private land.
According to the rules as I know them; it's legal to drive on a section line. The problem is all the what-if's. And what-if's are the reason we have lawyers and end up in court occasionally. Two different opinions on the what-if's cause problems which I personally try to avoid as much as possible.