Planing on doing some fall ripping with the ST310 panther and I'm thinking I may need some weights added to it. The tractor has 24.5x32 radials and none of them are ballasted. I'm going to be pulling a 9 shank inline unverferth at about 18"-22" deep and I'm sure in some of the hills I'll experience some slippage. If I were to use external weights where is the best place to put them and how much?