What do you have in mind with "better"? What do you NOT like about the way your Burb stops now? If you are intent on chewing up the rotor, get semi-metallic pads. They bite well, and will take the heat. Be forewarned they will probably squeal a lot.
For the ultimate in short rotor life, I will suggest the Albany semi-metallic pads from Auto Zone. I just replaced a set on my wife's Yukon after the RH pad's wear sensor went MIA and allowed the inboard pad to wear down to the metal & chew up my Wagner rotor
I now only use Wagner pads (i.e. a good, reputable name) on all my vehicles.
Out of curiosity, while good brakes are always a good idea, are you attempting to overcome some deficiency in your trailer's brakes? My '84, 3/4 ton Burb brakes work extremely well with heavy loads. If you are having trouble stopping, it may be due to malfuntioning trailer brakes.