Fridge/Freezer door opening while driving

I put small eye hooks on either side of the fridge and then put a bungee cord from one eye hook to the other. Very simple and inelegant. But it works, no matter how bumpy the road.

Also, make sure that putting the bungee cord in place is part of your written pre-departure checklist, along with retracting the stabilizers and removing the power cord and so forth.