This should be house number 1.
All house numbers in this park seem to be wrong. 
This is the park owners map of the area with house numbers:
https://www.landal.com/-/media/files/sli/sli_plat.pdf?v=638628427230000000_20240925083203

Since I'm not a local, I'm not sure if the house numbers on the map are different to the official numbers so I didn't modify them myself.