I'd think about the MPV's rather than estates. They give you a lot more room + comfort if you are sleeping in the vehicle. The sliding doors are handy too. You can attach a small caravan awning. Plenty of Ciroen Berlingo, Peugot Partners, Renault Kangoos MPVs out there owned by elderly folk - they are in good nick, low mileages for their ages lots of service history usually.
These vids might give you food for thought - https://www.youtube.com/watch?v=Oyffv623TDA
If you remove the seats can you store them at home?
These vids might give you food for thought - https://www.youtube.com/watch?v=Oyffv623TDA
If you remove the seats can you store them at home?