I think the Swift Forum gives good service, and is certainly the way forward for manufacturers to get first hand feedback on their products.
As for not replying to some questions, whilst Andy, Ash and others at Swift may know all there is to know about the overall build of their vans, they do not have in depth technical knowledge of each piece of fitted equipment such as the Aldi system, Fridges, Cookers etc etc etc.
In that case, it is quite reasonable for them not to post but either contact the appliance manufacturer and ask them, then post, or ask the appliance manufacturer to reply, as Sargent do.