The tires on a trailer must all have the same load range rating as each load range requires a different psi rating. If you were to fill them all to the same psi then the weight capacity of said tire would be compromised. Therefore, you are going to need to choose a new tires that matches the load range of all other tires on the trailer. If you were to go against this then you would be at risk of a blowout due to increased heat buildup.
If you can let me know what size tires you have on... view full answer...