Hi there I'm county I recently lost my disability premium due to moving out my old flat

I recently lost my disability premium due to moving out my old flat and want living alone as was with family, I'm now in a caravan untill I get a new place sorted , the DWP have said I might not be entitled to my premium bk even tho I'm living alone due to it not being a residential adress (house/flat) but it being a caravan. What's the difference that's can't be right sounds really unfair if that's the case, awaiting a call bk from them to see what they've decided, can anyone please help with any advice please, would-be really grateful. Thanks guys👍