WFCO Model 8955 is a very commonly used converter.
Here is some information from their website:
WF-8955
(Fully compatible with WF-8955AN, with next generation faceplate design)
"The WF-8900 Series has revolutionized RV power centers with its lighter weight, decorative doors and superior features. The WF-8955 model provides 55 Amps and a clean, constant 13.6 VDC nominal output, for reliable operation of electronics and appliances. Automatic three-stage charging extends the life of your battery with output voltage modes of 13.2 VDC range “float” mode, 13.6 VDC range “absorption” mode, and a 14.4 VDC range “bulk” charge mode. The 8900 Series also maintains peace and quiet, as the cooling fan runs only when needed."
https://wfcoelectronics.com/product/wf-8955-55-amp/
If you open the power distribution panel inside your trailer the converter make and model information should be pretty easy to see.