I'm planning on buying the MX5100DT, 4wd with FEL and AG tires. The dealer says they usually fill the rear tires with methanol/water, but if I want the front filled they will do that as well. I will be using the tractor for brush-hogging this year, and only using the loader on occasion (mostly in the winter). I imagine the tractor would be easier to manuever without the FEL, so I find myself wondering if the front tires should be filled as well, logically it seems the tractor may be a little light in the front without the FEL and with the added weight in the back. The terrain is generally flat, but there are some steeper areas. I usually try to go down hills, not up or sideways, but sometimes the unexpected happens. Any insights or suggestions?