Welcome to the forum! You are not giving much actual info about YOUR exact trailer. You should be able to upgrade your tires/wheels, but you need to measure the clearance available. You can get tire actual diameter numbers, for specific tires online. You need to keep in mind, the clearance between top of tire, to underside of wheel well. Also tire width clearance to fender, if applicable. One more item, measurement between the two tires. Normal minimum, should be 2.5-3 inches top of tire to under side of wheel well, and 1" plus, a minimum between the tires.
Jerry