galvanized pail http://apromera.com/ These bugs are here from the beginning of the game, now I learned to live with them.
5.a, On the smaller field north of the HQ you have to use the short side direction to not get stuck, like on the field near the Mill.
Every field has a good, stuckless direction, you will find it.
On the meadow near the sheep pasture you have to use the small loading wagon to not get stuck in the shack. Some tractors have a bigger turning circle they will get stuck into the shack and some have smaller they wont.
I hope it will help you.