Can you use passenger car tires on a camping trailer?

Yes, if you pay attention to these things: 1) match weight rating and speed rating 2) size for the type of use (best not use a 8" wheel to pull 3000 pounds at freeway use for wearability reason) 3) run them at max pressure rating to keep them cool from the sidewalls "bouncing" effect. This is due to worse shock absorption oon trailers. There is no other "secret" ingredient in trailer tires. Load and speed is only the issue when selecting tires for trailers. All other requirements for trailer use are lower than on car tires.