Help - what else haven't we thought about...

Looking for help here.  We have been towing a caravan for a long time, and we are pretty good at packing down to fit the available space / payload.  After 40 years trailer caravanning, we feel it might be time to change to something like a 6 metre panel van conversion.  We recently had a good look round a Wildax Constellation with a list of all the stuff we normally carry and managed to find a home for pretty much all of it.  However, we then realised we would seem to need a hose to fill the on-board water tank.  Then there are the levelling blocks and no outside locker.....

Questions are, are there any other motorhome specific bits and pieces we won't have thought about? Where do people keep these items - both in transit and on site? What do you do with excess stuff if you want to take the van off site (which is part of the reason for choosing this type of van)?  And, of course, the answers to any other questions you think I should have asked!