Hey, thanks for asking! I'm not a tire expert, so I suggest finding a trailer company or dealer near you and get their opinion. Second best is to get to a quality tire store (other than Walmart) for an opinion. We have tried passenger car tires and had no adverse affects. If you do a lot of rough roads (like most TX two lane roads) you might want something with a higher rating.
Be sure to be armed with your trailer weight capacity so you get a tire with enough load carrying capacity.
I don't think worring too much about tires is that trailer tires have a much easier life than cars and trucks... the surfaces do get used for braking, but that's the only time that they really mean any7thing in handling. If properly inflated they should track well. They aren't used for acceleration. Load carrying is their primary use so check the ratings of your trailer and at least match that. Keep them properly inflated. They are more likely to suffer from age and ultraviolet light damage than anything else.
If you don't like spending $0.75 to use the air pumps at a quick mart, go throuth the DIESEL truck lanes at a truckstop and use the airlines there. They are always free, have lots of pressure, it's a safe space even at night. The air hose will be right at the fuel pumps (along with hose for water.)
RV dealers recommend replacing tires in about 7 years, just due to age. Here's how to find the year and month a tire was manufactured.
Sorry I don't have a more definitive answer.
Jeff