I concur with Martin's point Drustan, look at each individual caravan on it's merits rather than as a brand because every manufacturer produces caravans that after a few years become damp to some degree.
Inspect each caravan closely, check the condition of the exterior first including the sealant around the caravan joins, around the lights and the grab handles. Dry cracked sealant is likely to allow water ingress.
Check the overall condition for signs of damage and ensure that the
CRiS number is etched into every window and is the same on each one. You can buy a HPI check via the CriS number to check out the bona-fides of a prospective purchase.
Moving to the interior as you open the door check for any musty odours. Beware if there are air fresheners r if the heater is switched on, this may be concealing something.
Check the walls and ceiling, particularly at the joins, around skylights and windows. Look behind curtains and gently peel pack window rubbers to look for black mould. Check for soft spots on the walls, check inside the lockers and underneath the seats and beds, especially along wall/floor joints. Ensure that the gas dropper vents on the floor haven't been blocked. Check around the toilet, wash basin and shower, inside cupboards and under the sink. Look for signs of leaking pipes or large spillages. A good torch and damp test meter might be useful. Before you start looking have a browse at the
Caravan Buyers Guide which will provide more tips and information.
Never buy a caravan without seeing it, it's surprising how many people do, and if things don't add up walk away!
There are some good well maintained caravans offered for sale but take care to find one, don't waste your cash on a shed
Good Luck and let us know how your search progresses
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