Ancillary tractor equipment may be mounted at the front or rear of a tractor. NB: There are three relevant modes of front and rear mounting here: (a) "Rear mounted" rear trailed equipment. (b) "Front mounted" rear trailed equipment. (Same equipment, mounted with drive and coupling facing the tractor - i.e. equipment covers ground in the reverse direction of its rear-mounted position.) (c) Front trailed. (Which refers to front mounting of specially-designed front trailed equipment - where drive and linkage is 'flipped' to the back of the ancillary equipment, so that the equipment moves across the ground in the same direction as it does when trailed from the back of the tractor.) The distinction is made in the reference video, which also contains supers referring to (the distinction between) front mounted and front trailed ancillary equipment.

--------------------------------------------------
Note added at 19 hrs (2014-11-26 11:29:49 GMT)
--------------------------------------------------

Another example of (c), above: a front-mounted, front-trailed mower. Note: mower mounted on front of tractor but design enables it to be trailed instead of pushed (<Trekken gaat makkelijker dan duwen>). Tractor is clearly moving forward (mowed grass is behind the mower). And: Tractor cab is at back of tractor. See http://www.fella.nl/schijvenmaaiers-frontaanbouw/

--------------------------------------------------
Note added at 20 hrs (2014-11-26 12:32:35 GMT)
--------------------------------------------------

Yet another example of (c) above: This manufacturer lists front and rear-mounted harvesters under <trailed harvesters> http://www.grimme.com/uk/products/erntetechnik-1 . Both front-mounted and rear-mounted harvesters are mounted on rear-cabin tractors!