I did a similar thing when I owned a 32' Avion travel trailer with 15" rims. I considered shifting it over to 16" wheels and tire but decided to try a set of Michelin SUV tires instead of all the ST/Chinese junk tires.
As long as you don't hit the sidewalls on curbs they work fine. I pulled that trailer 60,000 miles including a trip to Alaska and back including lots of dirt roads and, not in AK, some high speed excursions including to 98mph behind my '01 Dodge. I don't recommend it and readily admit it was foolish but did it. Never had a problem. The tires were maybe 50% worn when I sold the trailer.