[Festus2]

In addition to what has already been suggested, you might want to consider:

1) removing the batteries from the unit;
2) go through your exterior storage compartments and remove any items which might be "attractive" to thieves;
3) remove TV set(s) or other such valuables from the interior;
4) remove both tires/wheels and place unit on suitable supports;
5) remove tongue/hitch as opposed to installing a lock.