I just replaced my brake pads on my Trailstar trailer, took it and the boat on a test drive to the lake about 4o minutes away. when i got to the lake i noticed that the bearing grease had oozed on both wheels. I guessed that the new brakes got hot enough to make the grease run. why? theres no adjustments so will this correct itself in some way?

Were the bearings recently packed?  Perhaps they were just packed too tight.  Did you have a lot of downhill runs where you had to press on the brakes for extended periods?  If the breaks are getting hot enough to seriously affect the viscosity of your bearing grease, I'd guess you have problems.  But that is just a guess.

If the hubs were too hot to put your hand on, you've got problems.  I've gone through this twice....once with a Ranger (they sent me stainless steel rebuild kits free of charge even though the trailer was SEVEN years old!!) , and once with my Triton (brakes didn't release...cost me almost $350 for a complete rebuild using SS components).

If the brake shoes are glazed and the inside (contact area) of the brake drums are blue (sign of excessive heat) that's from the brakes not releasing. If the brakes look good BUT the hub and bearing components are heat damaged, that could be from improperly adjusted bearings (too tight)

You stated brake pads are these caliper style brakes?

Did you smell the brakes being hot or just noticed the grease on the wheels?

If you only noticed the grease on the wheels with no smell and you serviced the bearings when the pads were replaced, I would tend to agree with farmpond1, You may have slightly over packed the cavity in the hub or assuming if the hubs were removed you may have overtightened the bearings.

If the brakes smelled hot when you had seen the grease on the wheels.

You may have a caliper slider sticking not letting the caliper move enough and causing the pad or pads drag on the rotor.

It could also be the pads that you have used. The pad material could be too metallic for your application so that when the brakes are applied the heat generated can not be easily dissipated.