Seen this on another site.
Has anyone seen one in person or have one

Hi, gary in CA.
Various people did conversions for the D2s, D4s and D6s. I believe that Clewiston's down in Florida converted the D6s for work in the sugar cane fields, both 9Us and wide D6Bs - which led to them being called 'sugar babies'.

I don't know where the D4s were converted but I seem to remember that the D2s were converted by an outfit in Canada.

I have seen photos of them before but almost as common as hen's teeth or rocking horse droppings - - - - or honest politicians.

Just my 0.02.