my 4310 has loaded tires, and a box blade for ballast, which was enough. the 2305 i opted to not load the tires because it is very wet in washington, and i mow my lawn w/ it "see scary incident above" so i got a ballast box because of no need for a box blade at my home. i filled it with chip seal so i could remove the weight if needed. it weighs about 750lbs. that tiny tractor can pick up anything with that box on the back, plus it is super stable. loaded tires are not enough! they are so small you may only get 80 to 100lbs. per wheel. i recommend getting a ballast box or box blade and hang some added weight on it, plus a box blade doesn't seem heavy enough to to scrape hardpan and hardened gravel driveways w/out added weight anyways