Guys- I am looking to pick up a preowned tractor to replace my Dads- 40 yr old Kubota L235- Have settled on the Massy but notice that they went to the 1835 over the 1735- What is the dif?? Also we will be using the tractor to mow about 20 acres of grass that is somewhat on a slope- Would you guys rec. going shuttle or Hydro-I may not have a choice buying used- Any advise would be appreciated- thks