Most of us know they can open whilst we are driving along. Some have unfortunately had the door open and then part company with framework during the journey. If we put aside our forgetfulness it would seem to be down to two things, the door latch not being positive and bathroom wall flex.

Some owners get around the problem by leaving the awning against the door, others have used a small sliding catch and others a hook & eye.

It would appear this opening is most likely to happen on vans with a front diner area as they offer less support to the bathroom wall. If you look at the top cupboard above the seat opposite the door in you may well find a gap between it and the bathroom wall, you may find a piece of timber packing.
You may be able to part solve the issue by making sure the packer in here is tight and screw through the cupboard side and packer into the bathroom wall. I did this on my 430 and it made things far more rigid.
Next step is some owners have a pin on the back of the door in the top corner. This locates on a metal bracket [that wears] attached to the bathroom wall. You can adjust this for a better fit, but need to take care. The van floor will flex and if you have put it into twist by over doing a corner steady then it will not be in the correct place. I lowered the legs on my Triton to just above ground, made the adjustment and then removed one of the screws and put a small bolt through.
In the 6 years I owned my Triton the door never opened on a journey, so I was either very lucky or the two fixes worked..

I've now got a Feeling and the wall does not flex, but the I've still got the door latch not locating very well. I've adjusted the hinges after the door opened on its maiden voyage but I wanted a 100% fool proof solution. I do not mind putting holes in my vans, but I wanted a solution that limited the number and could be removed and show little sign of intervention.
I decided on a turn button, the sort some of the more mature members will remember seeing on cupboard doors of simple cabinets.
The solution was a 50mm disc of 6mm plywood with a stubby length of broom handle on the back. A 6mm dowel off the centre line and a blob of glue holds the two together. I was going to screw this to the bathroom wall, but found I had a M6 stainless coach bolt in my fixings with a nice domed head. This goes through the centre of the broom handle dowel and a hole at the top of the bathroom wall. It's held snug with a stainless steel washer and locknut. I've added a felt pad to the reverse of the disc for a smooth fit against the door and a dowel pin so it cannot rotate out of place.
I did think of fixing it at the bottom of the door where it would be out of site but realised I'd walk into it. The 6mm hole through the bathroom wall can easily be plugged with one of those beige caps you get with kitchen units to go in unused holes if I ever wanted to remove the turn button.

Hopefully I will have success - Colin

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Thinking of above comment on wheel balancing. Our new van does dot have balancing weight on the wheels. When we returned from our second test run away the lovely Mrs eribaMotters had left a washing up sponge, cloth and tea towel on the kitchen work surface. When we got home they had not moved.
For those who would like something a little more "factory fit" in appearance to keep th door in place, how about one of these:- Werbung: https://www.ebay.co.uk/itm/354981452380?...9&segname=11304

Colin