I'm buying an L3800 and trying to decide on a cutter. The dealer is recommending a 66" cutter. It looks like the tractor is 55" wide at the wheels. It seems to me a 60" would be ok. Is a 60" to close along a fence line, sticking out only 2-1/2" a side? It's about another $500 to go from 60 to 66. Is the extra width worth it? Land Pride RCR1260 or 1272.