In the van-life world, where photovoltaic electronics frequently supply house power on a conventional ICE vehicle, you will occasionally see either static-deployable panels (i.e., stored aboard the vehicle in transit, but staged on the ground when camped), or fold-out panels (which remain fixed to the vehicle but deploy outward, often providing additional shading).

There's also an advantage in warm climates / seasons to a stand-off roof --- air-gap between panels and the actual surface of the vehicle) which provide effective shading and reduce cooling load --- either to permit passive cooling via fans or as an assist to an air-conditioning unit (fairly rare on vans).

There's also a pretty frequent use of fuel-based house services: space heat (e.g., Webasto heaters, by Cummins: <https://www.cummins.com/na/sales-and-service/webasto-heating...>), stovetops (often propane), and hot water, though you'll also see electric (induction cooktop, microwave or electric oven, electric hot-water, resistance strip heating in floors). Latter require a pretty beafy electrical system, generator, and/or "shore power" (connection to grid mains).

(I've looked into the van-life thing for a while. Ultimately it's expensive for the nicer rigs and/or involves a lot of sacrifices, and combines risks of a residence and vehicle. Not to say it can't work, but there are major considerations, and the postcard view often provided is not the whole story.)