You may want to go ahead and order the aftermarket metal bracket set Norcold will sell you for a nominal fee. They sell the metal brackets to reinforce the abs hinges which they know are extremely fragile, but if they install the brackets in the manufacture of the units it would for one, cost their stockholders that extra $1.25 they were counting on and the CEO could be fired. For two, you wouldn't pay $39.99 for two brackets worth a quarter, when their plastic hinge breaks, making the CEO appear like a marketing genius and resulting in high fives all around in the board room.
I have used the metal type JB Weld many times with great success in some very interesting places. They sell a JB Weld for plastic now but I have not used it, but would sure give it a try. If it is as good as the metal version you may not need to replace the door.
Without the metal reinforcing bracket I have reservations about JB Weld holding the hinge ie., the weight of the door. Don't know for certain that it wouldn't.
No amount of buiding or installing correctly is going to prevent you from parking on the side of a hill or driving in the mtns. with your absorption refer running. And btw., a Dometic absorption refer is subject to overheat no different from the Norcold.
You discredit the RV community. Park on the side of a hill if YOU like but most of us know better and if forced to park on a hill we will turn the frig off. You show your lack of knowledge. Mounting driving will not harm an Absorption refrigerator.
In my case, 10 years from now, when I need that other hinge I kept just in case, I'd turn everything upside down while uttering profanities for an entire day, then buy another ( the day after I'll find the one old one). History is prologue.
