After I let my boat trailer sit for a while then try to move it, there is a slight grinding sound that eventually goes away after I pull it a bit. Sometimes there is enough friction to make it a bit difficult to even move the trailer. But once I "break" it free, it rolls smoothly albeit with the slight grinding sounds. I hava 205sf with tandem axle and drumb brakes. I belive the sounds are eminating from the brakes.
http://www.healyadventures.com/personalgraphics/Hatfield2002/P5260588.JPG
http://www.healyadventures.com/personalgraphics/Hatfield2002/P5260588.JPG