In Europe the Fiat Ducato, the Peugeot Boxer and the Citroen Jumper are sold also in 4 wheel drive versions. These version are manufactured by a french company called Dangel, but sold by the official dealers. The trasmission scheme is very interesting, because it's very low and the floor of the 4x4 version is the same of the FWD vehicle. The Ducato 4x4 has viscous coupling to transfer torque on demand to the rear axle and optional limited slip or locking rear differential.
http://m.youtube.com/watch?v=mQuGUUEKO-E&desktop_uri=/watch?v=mQuGUUEKO-E
A secret of the great success of the Ducato on the RV market in Europe is the egreement between Fiat and AL-KO for the motorcaravan chassis.
http://www.al-ko.co.uk/section/amc-motorhome-chassis.html
On these chassis the width of the axle is larger than the front wheel in order to encrease the stability on the road.
http://m.youtube.com/watch?v=mQuGUUEKO-E&desktop_uri=/watch?v=mQuGUUEKO-E
A secret of the great success of the Ducato on the RV market in Europe is the egreement between Fiat and AL-KO for the motorcaravan chassis.
http://www.al-ko.co.uk/section/amc-motorhome-chassis.html
On these chassis the width of the axle is larger than the front wheel in order to encrease the stability on the road.