You'd have to support/protect the stem from breaking during the trip somehow. Make sure the pot can slide around and is secure and the stem can sway around and snap.

Here is your advice, wait to move during the winter when they are dormant, lol! Seriously though I just moved my whole amorph collection, minus a few I had duplicates of :( In any case they transported just fine with minor damages. I had a pickup bed with a camper topper. I just filled the bed so tight that they had no room to slide around. The ones I put in the moving trailer wiggled around a little and some pots got crushed from sliding into each other but nothing drastic. As far as anything snapping you would be amazed at what these wonderful plants can withstand. We had gale force winds and a storm suprise me here the other day. My whole collection was sitting outside during it. It knocked a few pots over, but the rest just went right on through while sitting up. I had only one snap its petiole loose from the tuber, but it was really my fault as I planted it too shallowly. One other had a bent petiole, it has since healed itself and straightened out. They are tough. It goes without saying but be very careful with terra cotta pots. Really secure and pad them. Just a little bump against another one and crack! Only other thing I can say is to the best of your ability make the trip as quick as possible because trailers get very hot inside sitting in the sun and it will heat stress a lot of plants. Otherwise good luck.