Caravans and Mobile homes are specifically addressed on the Firearms Security Handbook 2005.
This is what it says...............
Mobile Homes & Static Caravan Units
2.25 The unit should be site fixed or any wheels and towing assemblies removed or disabled to
prevent its immediate removal.
2.26 Where there is doubt about the fixture, supplementary anchorage with industrial ground
anchors, locking plates or security chains should be used.
2.27 The area between the ground level and underside should either be enclosed with secure
cladding, or the area giving access to that part of the chassis securing the cabinet should be
protected to prevent unauthorised access to that area.
2.28 A cabinet to BS7558 or better, or a commercial safe should be used in dwellings of this
type. Ideally (because of the construction of some mobile homes) cabinets of heavier
construction may be warranted or a dual layer system to protect the area of installation. When
considering installing heavier cabinets or safes the load bearing capacity of these structures must
be considered.
2.29 The cabinet should be located in a position making attack on it difficult.
2.30 The cabinet should be concealed in an area which is not easily/normally accessed (eg inside
fitted lockers).
2.31 The cabinet should have the maximum number of its anchorage points attached to the
chassis of the unit. The blind heads of any fixings should be outside, with the threaded nut within
the cabinet. It may be prudent to have the fixing points welded to the chassis.
2.32 Alloy chassis require special consideration. If the structure is in doubt the provision of
bearing plates not less than 4mm thick and large enough to span several adjoining chassis
members can be fitted. Alternatively, the below method can be utilised.
2.33 Where the chassis is not substantial, a concrete pad containing securing bolts to attach to
the security device should be made underneath the unit.
2.34 Industrial ground anchors can also be adapted for this purpose. These should have a
protective enclosure to frustrate access from outside (see paragraph 2.27).
2.35 An intruder alarm should be considered the primary method of adding security to such
premises.