I've tried inflated tires on a few different trailers over the years - always ended up with a solid wheel given the trailer tongue is awkward on that nose wheel and puts side loads on the tire. The best wheel I found was a solid metal wheel off an old cart we had at the ranch that looked like it was used for a welder cart guessing it was 1920's era metal wheel best thing ever! Never had an issue with it after I put that one on the trailer. That old saying they don't make stuff like they use to for sure applies to these little wheels. LOL
If your trailer tongue is light enough I could see the inflated tire idea working OK but I doubt any of us can find a small tire these days that can handle 150-200lbs and the side loading that comes from pushing around the trailer in the dirt etc. Too much stuff from China ;-)