Why was Fiat Ducato chassis voted for best chassis to use for motorhome in its class  ???

Not all manufacturers of chassis are the same - it is very important to understand this for the following reasons

Most important  factor is

INCREASED REAR TRACK

The Fiat Ducato has an increased rear track (1980 mm, category best-in-class, 190 more than the standard track) permits greater stability on the road -  and offers greater width for the living cell.

This is important - if you dont have the wider rear axle on a motorhome in this class -
then a vehicle will wander all over the road and hard to control on the road .
We have seen this happening with some other brands of chassis  - they are on the market  today -

This is why  Fiat Ducato is recognised in europe as the best selling motorhome with at least 85% of sales the Fiat chassis

You have to remember -
In the Fiat Ducato Factory  in Sevel Italy  - they are still manufacturing 1000 units per day   !!
You did read it right  - YES one thousand units per day