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Desiccant type all the way, they are most efficient at lower temps (7-12c IIRC) which is pretty much UK holiday temps. Mate has a LWB/Jumbo Iveco van with two sets of bunks in it, full workshop + storage in back for 4 mtbs'. Has a fan that sucks air through the floor (has a water trap) behind rear bumper, and blows it through bike area then exhausts out of a roof mounted spinny thing that doesn't spin anymore. Means when you put bikes away you don't have to be precious about drying them off, the fan does it for you (50-100w indoor type fan).
For the van itself he has a huge battery bank to run heater/desiccant dehumidifier (just a household on on an inverter, draws 600/1200w and has the benefit that also provides warmer air than what goes in, so super efficient for low temp environments) and other gear. Big batteries weigh a low, and think his van is 4.5t rated (has the dual wheel back axle).
Have stayed in it twice and both times its been winter, running the desiccant dehumidifier overnight for 3-4 of us has been plenty to keep us warm/ not have every surface dripping in condensation in the morning.
Think he has a webasto as well, but unless its sub zero you don't need it, just cooks you! Great to heat up when you get back in from riding though without running engine (makes heat a low faster than the engine does too).
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BrickMan
@Dammit
Ok, in which case I think there are two elements - the ducting to ensure that air is evenly drawn from all around the top of the compartment and fan itself (I'm incorporating the shroud for the van exterior with the fan).