When considering Jonathon's view, remember he is a professional mechanic, his equipment is in top shape, finely tuned, and the mechanics of his decks are impeccable.
Now for the rest of us, a 50 inch deck on a 10HP tractor is not practical.
Your 1811 should have no problem handing the 50 inch deck. I use a 50C on my 784 (older version of the 1811) with NO issues.
