[JRTJH]

Most of the cabinet stiles are made of vinyl wrapped "glued sawdust" (MDF). It will absorb moisture and swell. If your trailer was covered with no ventilation during storage, you might have a humidity related cabinet problem. Try ventilating the trailer, some heat, dry the air and hopefully things will "shrink back to size" in a couple of weeks. If not, most cabinet doors are held in place with hinges that can be adjusted (bent) to make up for small distances. You might be able to dry the trailer, adjust the hinges and make things work without doing anything major.

I caution people in very cold climates where there is substantial snow to not open roof vents for storage (even with vent covers on the roof). What can happen is just enough snow/moisture can form in early winter to cause a dam of ice around the open roof vent. When the sun melts the rooftop snow, it can run into the trailer through the open vent. That moisture, even if it's not enough to cause damage to the flooring, is often enough to increase the humidity inside the trailer. Then, as the sun heats the trailer through the winter, that moisture is absorbed by the "glued sawdust" causing it to swell.

Whether this is what happened to your doors is not for certain, but trying to keep your trailer dry during storage and ventilating it when possible will help with humidity problems.