I think that JD offers that 30XXD tractor as an entry level machine,, for people that need to pull.
My BIL had over 1,000 acres when I worked there in the 1970's,,
and he had tractors that never powered anything with a PTO,,
So, the 30XXD machines do fit a niche,, I purchased my JD 4105 used, and,, believe it or not,,
the previous owner thought that they had worn out the tractor, and the PTO shield had NEVER BEEN REMOVED!!
I was the first one to ever remove the PTO cover,,, and the tractor was pretty ratty looking by that time.
Here it is, right before I bought it, you can see the PTO cover is still on,,
(all the manure is still "ON" from the previous owner)
So, even in 2014, this PO purchased a tractor intending to never PTO operate anything,,
and traded it in, only two years later,,
(the 4105 spent its entire early life pulling a manure scraper that was made out of 1/4 of a LARGE loader tire)
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I would LOVE for those VENTRAC people to remake the YouTube video comparing my 4105 to the VENTRAC,,
I think the results might be slightly different,,,,,,,,,,,,
(They compared a VENTRAC with TEN tires,, to a JD with only FIVE tires,, that is a two to one difference!!)