I don't see weight limits on any of the kids rails that I've looked at online, but some specific for ages 5 and under. So depending on how likely you are to roll and put full adult weight against the rail, I'd hesitate to recommend a product intended/designed for use by children.
The medical supply companies may have something for you. It's hard to see specific products on the Care Medical site, but the Orlando Medical Rentals site indicates a "hospital style bed rail." Or maybe you can explain to them what you use at home so they can offer something similar. Good luck!
Enjoy your vacation!