What type of soil conditions and terrain? I.e. Flat or hills.
Pull type 3-16's will be a load under most conditions. Breaking Sod it may be to much.
We pulled a semi mounted 4-16's in corn stubble and lighter soils with our 5,000. Power wasn't the issue it was weight. We had 15-5 x 38 tires with fluid in them and it was still a weight issue.
In Sod or tough ground we had 3 -14 pull type and that was all it wanted due to traction issues.
Another problem was the front wants to star gaze real easy with the semi-mounted. We had a rock box that we filled with rocks. Weight???
For all around use I would recommend semi-mounted 3-16's and probably 4th gear in normal conditions and 3rd in hard going.