The risk of having a vehicle accident driving to the job site is probably many times higher than the risk of the tree suddenly uprooting while you're in it. It doesn't appear to be in a low area that would be supersaturated. You could always take extra time and put a couple of slightly tensioned guy ropes on it for peace of mind. I'm guessing you could break a pickup truck in two trying to pull it over with a running start. I'd do a good inspection from the ground, look it over with binoculars and, if nothing looks out of kilter, go to work.
Last week I was taking down a 65 ft 18" DBH white oak with fungi all over it and a dead, bare top. Had to go to plan B halfway through when I found it was too soft to hold a spur. Still, once it was on the ground cut up, it was obvious there was still enough good wood to hold thousands of pounds, except for the completely dead top which I dropped in one piece.
Last week I was taking down a 65 ft 18" DBH white oak with fungi all over it and a dead, bare top. Had to go to plan B halfway through when I found it was too soft to hold a spur. Still, once it was on the ground cut up, it was obvious there was still enough good wood to hold thousands of pounds, except for the completely dead top which I dropped in one piece.











