To date, we are not aware of any damage to a motorhome or caravan as a result of a lightning strike. However, it is always better as a user to rule out all factors that favour a lightning strike in advance. You can minimise the danger if you do not park your leisure vehicle in an open field or on top of a hill where it is not exposed.
As a precaution, people in caravans or motorhomes should avoid direct contact with cables and metal objects during thunderstorms, whether the Faraday cage principle applies or not.
For caravans or motorhomes with a non-metallic hail protection roof made of GRP, for example, the factors mentioned at the beginning should always be taken into account. No lightning-dissipating elements are incorporated into GRP roofs. A GRP roof attracts far less lightning than a sheet metal roof would.
The question of whether or not to stay in the vehicle during a thunderstorm should be answered by everyone for themselves, because assuming the extremely unlikely event of a lightning strike were to occur and only because this was caused by negligent positioning: whether a Faraday cage or not, you would be protected from the electrical charge in the event of a strike, but you would be exposed to the extreme brightness, the more than deafening noise and the vibration.