Thank you for your question. You can add up to 100 lbs.
Somewhat, but not it's true intent. Works on thatch.
Yes it does if you have a hitch on your mower there are aftermarket hitch that you can buy if it doesn’t have one
I don’t have it any more but it was about one foot square by 40” long
Works perfectly on my 170.
It seems to pull up everything to some degree.
Don't know about the D140 but the unit has a height settings for the wheels to account for different hitch heights of tractors and two depth settings for the thatcher springs. No additional hardware was needed for my E100. Deere has a accessory compatibility web page.
Yes it is very easy to use and pull
They make front thatchers for mowers also need to turn about a 5foot radiouse