This is how the hinges look on our older Norcold N811. The upper one (bottom of the freezer door) has the original large-headed #10 screw, threaded into metal. The lower one (top of the fridge door) shows how I drilled through and installed 1/4-20 stainless bolts, nuts, and bushing to match the original screws. Those screws stripped out on a trip. The top let go first, so the door didn't actually fall. I was opening the door and caught it.
You can see that both parts of the Hinges are Metal.
Here's a suggestion: Find or make a "Shim" to support the door between bottom edge and frame while on the road. The hinge may fail on the campsite, but I believe the damage starts on the road. At least on ours, fridge is right over the rear axle and it rides like a boxcar. Shim is a couple Home Depot paint sticks. Lowes sticks aren't quite as thick, I'd probably need three.
If God's Your Co-Pilot Move Over, jd
2003 Jayco Escapade 31A on 2002 Ford E450 V10 4R100 218" WB