We have a french door residential fridge.
This is what our prep fridge looks like.( I tried rotating it but it insist on posting sideways.)
That is a cutting board with a dish towel and some foam to hold it in place. Everything in an RV should have at least two uses ;-)
Below the french doors is a block of foam that fits very snug and supports the door so that the dynamic loads of driving do not stress the hinges. The freezer door is well supported so it can take the load. If it were not I would place foam underneath it as well.
We try to lighten the doors before traveling by putting heavy stuff on the bottom shelf. We also move heavy stuff down from upper shelves.
We have three curtain rods that are used to hold thing in place.