Projected cost for a year - What do you think?
Van:
Forget new or used van, or lease etc.  Forget fuel costs too as they can vary considerably from area to area.
 Just a ball park figure to put and keep a van on the road, include average annual cost of van and maintenance bills
System:
Forget top of the range thermopure.  
Just the necessary average kit for average one man.
I'll do a calculation too, lets see what we come up with.  Let us know what you've included (not details of manufacturer type stuff) as kit
Might be interesting...