I moved Walnut logs that were 30" diameter x 20 ' lg with my Kubota
L3700 so I would think your tractor is plenty big enough. I did a total of 5 semi loads and I used a set of logging tongs on the 3 pt hitch. A couple of safety fanatics warned me about how dangerous this is but quite frankly I never had any problems. Get the leading edge off the ground and go slow until you get out of the woods, once out in the open field I took off for the pile. Maybe once or twice I got the front wheels off the ground by an inch or two but never felt the tractor was out of control. My tractor is HST so it is easy to go easy.
Now felling those trees was a totally different matter. I had two or three bad experiences. And I mean I scared the crap out of me. Those big ones go where they want to and you never know what is going to fall out of them. And they are hardwood heavy. I had one 44" diameter at the base, and no matter what I did, it couldn't decide where to fall. When I finally got it on the ground, I quit for the day, I drank a 12 pack, smoked 4 packs of cigars, and had a serious discussion with Jesus. Just be careful, go slow, and don't think for one minute that you know what you are doing. Good luck!
CJ