Van conversions

I know this is probably a strange question but has anyone on here got an Autocruise with seats at the rear by the back doors if you have several questions what is under the seats? How long are they? and what is the inside width of the van? I have an Autosleeper Midas but am thinking of changing, problem being I have 7 dogs and was thinking of taking out the rear seats putting in a dog cage and having a double bed over the cage, usually it is just me that goes to dog shows also in the front of the van would there be room for a large GSD to sprawl out? Thanks