As a farmer myself, gotta wonder why not go and buy a Cat 45 or 55 and hang tanks and a boom on it...They make low disturbance tracks with blocks instead of lugs. More money than the tucker, but lots more machine too. tuckers aren't built heavy enough for Ag work IMHO, and parts are more money than Cat parts as well.
Seems to me a pitty to take a super nice clean vintage Tucker out to the fields, but it's your operation, not mine.
The trimble unit should work. Do you have the easy steer wheel motor? I don't know how much force is needed to work the steering wheel. As long as it is relatively easy even the easy steer option should bee enough.
I'm curious, please let us know how this works out for you....
Regards, Kirk