This is my first post but I've been looking around for awhile. I've searched but only find info on the intended usage and nobody mentions what I'm interested in. I've been planning on building a Toyota Van or a Previa for family camping and DD duty. I had the bright idea of installing a block heater (or 2) and maybe a 12v coolant circulation pump along with an onboard battery charger like you would find on a boat. All of this for the purpose of heating the interior of the van in the winter. I want to be able to plug my van in at a campsite or on my family's property and run the vehicle heat with no worry of fire or CO. I'm just not sure if a block heater has enough wattage to keep up with heating the inside of a car or if there are better solutions for heating the van without burning anything or risking a fire/ toddler burning themselves.