See the thread under Burstner in Buyers Guide Caravans.
From my research of the electical side it is an offence not to provide a handbook covering at least the electrical side, but as I have explained there the Burstner manual is the sorst I have ever seen in this respect and to all intents useless for trouble shooting.
Not if you want to know how to arrange the seat cushions, then there are 5 very clear pages showing you exactly how.
Also beware that it seems Burstner vans do not carry a certificate of electircal compliance, so please check out the electrical installation (mains) or get some qualifed person to do it for you.