Do you really need so much stuff that you need storage on land? For us when we moved aboard some 20 years ago part of the appeal was to be able to DUMP! We found that though it was hard to rid ourselves of all the modern day trappings once we had done so it was a great relief.
Our choice of boat initially was a 40x12 cruiser on The Broads, 10 years on we moved to the Fens and onto a 60ft NB.
At no point were we camping, we had a full size under counter fridge, and a full size under counter freezer, both 12v, full size auto washer, tumble dryer and a 2 seater sofa across the boat so no pulling your legs in. Our bed was lengthways down the boat albeit only 4ft wide but as long as a conventional bed.
Living aboard comfortably only requires a bit of lateral thinking.
Good luck with your quest
Phil