Motorhome security when away

there is lots of advice about making our Motorhomes secure when at home ,but when we have been away on holiday and see M/H's parked up in car parks I never see anyone put wheel clamps on ,I fit one when we are parked up in car parks , perhaps I'm paranoid about it not being there when we come back , I do use other "internal " security devices 

do some let their guard down when away ???