About three years ago I talked to a guy from hydramaster about doing this very same setup using the generator and motor.
I see that Sapphire Scientific just posted a teaser video on their page on Facebook. Hope it comes with a better paint job... exciting year... maybe...
I have never seen one with a door port... but I will take your word for it. Seems like a good idea to prevent theft and liability issues if a kids crawls into the van. I din't know that HydraMasters cds did that.