I was wondering if anyone can help me out pick the proper width of a brush hog for my 855 compact. It is 19 HP at the PTO 24 HP engine. I am debating between a 4 or 5 foot model. Some people tell me 4 and some 5.... I will be mowing mostly open field grasses. Some thicker spots of crown Vetch as well. No trees or anything. about 3 acres is on a hill that I will mow cross ways. The rest is in open relatively flatter slopes. Grass is about 2 to 3 feet high at cutting time. Thanks!