MWB and LWB Mercedes

Hi
    I have  noticed that some of the earlier AS Mercedes coachbuilt's were on a LWB chassis  and are now a MWB with what seems a long overhang at the rear,Is this cost cutting by AS or are the newer vans lighter and do not need the heavier chassis?
Regards
Alan

Is that true? The 6.5m lengths, Bourton, are on MWB (3665mm), the longer ones , Burford & Malvern, are on LWB (4325mm).

If the longer ones were on MWB the overhang would exceed the legally permissible length behind the rear axle.

Hi Everyone
      I got it all wrong,I thought I saw somewhere that the later AS Gloucester & Malvern were on the MWB chassis,It was not too Christmas cheer I can assure you any way have a good new year 
Happy Motorhoming
Alan