Small(ish) motorhome.

We take our Laika round the Supermarket car parks when we are out and about. You just have to watch for overhanging trees etc. Sometimes you find a height barrier so you just stop somewhere else. The Laika is 7.5m it's just what you get used to.

Have a look at the Swift Select range. I have a 184 - nice - if you are using for one/two, you can leave the rear bed made up and still have space to sit, etc.

My Marquis Majestic 125 is 6M x 2.14M, has four belted seats, fixed bed, garage, loo and shower combined. Unless you go for a VW type, which you have found too small for serious holidaying, this is about as small as it gets. Given the congestion around the school gate, it is still going to be a bit unwieldy, although not impossible, doing the school run.

We were looking at a Devon Firefly conversion on site (very nice owners) based on the Ford transit panel van it has all you seem to be looking for,,it was also an automatic

most Ducato based PVCs that have 4 belts tend to use a half dinette for the seating which means it's not easy to make beds from, so there is inevitibly a fixed bed...

to have seats that have belts but can be turned into a bed you're probaly looking at the VW sized van (or even the transit as mentioned above.

make up beds and seat belts don't normal.y come together.

Dreamer (Rapido) have a four (+) berth PVC with shower and roof bed which might work.

there are a couple of Merc or Crafter based vans which have belts but the typical rear lounge pull together style can't provide the belts you. need.

the VW type rock n roll bed faces forward and allows for seat belt but is a small unit.....nice to drive but too small for some to camp in.

its a dilema....which bit of the compromise is the most important?

driving/parking, four belts or touring comfort?

Been doing similar research, currently exploring van below and a similar Adria. The drop down bed on the one below has a low height for easy access as a 2 berth or a higher position for 4

https://www.rollerteammotorhomes.co.uk/range/t-line/590

Does it have to be new? Some of the older VW monocoque models come in at 5.5 metres and are brilliant two berths. We know because we have got one. It all depends how “occasionally” the school run needs doing. Some models do have the extra belted seats, but you are giving up a lot for those occasionally used seats. We use our VW MH for some day to day journeys, but it still needs thought about the parking. Supermarkets and big car parks a doddle. Fighting it out at the school gates? Too precious to even consider.

Second hand comfort and usability, use the savings to get another vehicle second hand car to do the school run? 

If you are Ok buying a van which is a few years old it may be worth looking at an Auto-Sleepers Symbol ES. 

The van is 5.75 metres long, including a rear step which could be removed if that extra length creates a problem. I think it is 5.4 metres long without the step. The ES version (no longer available new) has 4 seatbelts. The off side travel seat can be turned into a bench. The sleeping arrangements can be either a double or two singles. The dog could sleep in the space at the back between the fridge and the loo or between the single beds if you use that configuration.

We have had a Symbol ES for ten and a half years during which time it has been our only vehicle. Being a panel van conversion it is narrower than most (if not all) coach built vans. We have had few problems parking it (if there are no height barriers) especially if there is a parking space with an area behind for the slight overhang.

Hi we have a Rollerteam T590 as mentioned by Viatorem, after following many threads on subject, used advice and researched all, it suits us, 5.9m compact though all we need and more. Best advice was make a must have list and go look, Benimar, Swift, quite a few makes have them, good luck.

the A class version called the Pegaso is (IMV) even better than this little belter....

why?

becaus the drop down bed is over the (wider) cab and not the lounge so that the lounge can be used at the same time as the bed is deployed.

A class leading van in many magazine polls.....

the half dinette has two extra belts, large lounge for dog (if reqd) and decent storage.....a terrific little an at a great price, might even get a pre reg one at a good discount.

https://www.rollerteammotorhomes.co.uk/range/pegaso/590