I'm unfamiliar with the doors in your trailer, are they a kitchen cabinet type raised or flat recessed panel door?
As a professional cabinetmaker, I am though very familiar with woodwork and finishing.
More often than not, I'll opt to replace doors instead of sanding and refinishing.
There are literally hundreds of cabinet door suppliers out there, and you will be amazed at how economical the replacement option is. Especially if you factor in the cost of your time.
E-mail me and I can help you further.