1. Trailering - that trailer is probably going to weigh 4000 lbs itself, be sure to check. Like I said it adds up quick!
2. A Tractor is not a SS. If you go pushing on trees like you can with a SS, you are likely going to bend the FEL arms. As you know, SS arms are reinforced by the frame when in the fully down position, giving incredible strength. Tractors with a FEL do not have this support.
3. I grew up in TX, still have 100 acre family hay/cattle farm in Athens. I know cedars all too well, I just havent pushed them over with tractors
4. Forestry mulcher - you may be able to get bulletproof or comparable glass installed, it will just cost more. I am not sure. I know for SS mulchers, they require special glass for the mulcher models. Not sure on the land shark, but a well made bush hog on a 4707 should cut some serious growth. Some rotary cutters can work on 4" saplings...that is some serious cutting!
5. Ouch on the auger, any chance you can rent one? Assuming you dont want to go into the fencing business
6. Baling - good, it is expensive. Get ready for a new tractor and some serious equipment investments if so. Another option popular in TX is baling on the halves. You let a larger operation bale it, they take 1/2 and leave you 1/2 of the bales. You could either sell them or use to feed as needed.
7. More tractor IF you are planning on baling/haying is what I meant. The 4707 seems great for 60 acres for everything but baling.
8. Keep in mind if you are mowing, you are not going to want to mow 50 acres with a bush hog. It will take you days. You may want something with more width (multi spindle, batwing, etc). We used what I called "weed slingers" that was a gearbox tied to the blade and wheels. It was a pull behind. Wheels turned, blades turned. We use this for field mowing when not haying. Not sure what others use today.