This is a very good post and is kind of where my thoughts are. Ever since jnr was born I've given up my old interests if they can't be done with a young child / baby / toddler. Walking has always been possible just not the 26 mile jaunts. As a baby jnr was in a carrier until walking. At that point he's wanted to be on foot. Mind you not all bad. At 3 he was doing 3 mile walks with a bit of me carrying him. It always impressed me the terrain he coped with from the earliest days of walking. He had the same attitude as me, you just get on with it. That attitude got me through challenge walks 50 miles long in 16 hours (not impressive but I'm not a runner or sportsman so it's good enough for me).
Campervan is something me and my partner like but the cold, dark nights in a cramped van isn't a good idea for my partner. For the reason you said. That's why my partner likes caravans. They have more room.
Current thinking is to get a caravan initially. Then replace the car with a campervan or small van conversion for longer days. Then add a towbar and keep the caravan for winter. A 4x4 van could cope with a caravan I guess. Anyone know?
Pretty much anything above an old VW camper should cope with a caravan. Certainly a transit size van would be fine