Campervans and Motorhomes are very popular especially at the moment. You have to have somewhere to keep them though and would need to use them enough to justify having one.
We did consider hiring a VW T5 but those are fairly small and having to book and pay for campsites means its probably dearer than staying in a hotel with proper flushing WC, bed and facilities.
Her indoors wouldnt wildcamp as paying to sleep in cramped conditions at the side of the road and cr@p in a bucket inside a van isnt her idea of fun.