Ask anyone in the Norcal Cobra club how much time my car spends on 'it's' trailer!
The trailer was used, & had car tires on it 3 years ago when I bought it.
I have just replaced all 5 of my 16' open trailer tires with some good automobile tires. You can't beat the price, $350 and Les Schwab's lifetime flat repair!
Balance them just like you would for your car, and they run very smooth!
jdog