no condensation if the vans got some sort of lining on the roof/walls as its the hot air meeting the cold air that will give you that .
You can drive along with these going - lots of the old air-cooled camper guys use then for there normal heating.
Very easy to fit - connect gas, connect 12 v , connect stat, connect air pipes, drill two 1inch holes in floor - turn on easy.
I have a spare battery to hook it up to that will have a split charge relay on - as i dont want to come down and have a nice hot van only to find i cant start it - lol thats the sort of luck i have at the moment.
cost running - ?? they not ment to use much , i just bought a 19kg propain ( which is big ) for £24.50 with £8 deposit on the bottle so we will see