You can always use any tag you want. A different question is, if is going off on a tangent your own is always the best course of action from a practical point of view (for example will data consumers actually do something with my newly thought up tagging), tagging and so on), so most contributors tend to stay with popular tagging (and with will change tagging that they consider out of line). line with that). In any case you should not just check the wiki but have a look at taginfo https://taginfo.openstreetmap.org/search?q=trailer_park#values which would indicate that the tagging is not so very popular, but in use. You can always start a discussion on the tagging mailing list https://lists.openstreetmap.org/listinfo/tagging in this case, due to cultural considerations, actually asking on the US list might be a better approach https://lists.openstreetmap.org/listinfo/talk-us

You can always use any tag you want. A different question if is going off on a tangent is always the best course of action from a practical point of view (for example will data consumers actually do something with my newly thought up tagging), so most contributors tend to stay with popular tagging (and with change tagging that they consider out of line). In any case you should not just check the wiki but have a look at taginfo https://taginfo.openstreetmap.org/search?q=trailer_park#values which would indicate that the tagging is not so very popular, but in use. You can always start a discussion on the tagging mailing list https://lists.openstreetmap.org/listinfo/tagging in this case, due to cultural considerations, actually asking on the US list might be a better approach https://lists.openstreetmap.org/listinfo/talk-us