Well, I had been keeping up on this thread. Sided with those who thought they shouldn't be messed with.
I was a boater and always saw trailer problems with bearings on somebody else. But those bearings were dunked, dried, rode hard, dunked again, etc. I understood that water would get in, rust, create friction that would cause heat, boil the grease and boom -- problems.
I also had a different rig for 6 years (31' Keystone Sprinter pull type). Rode it pretty hard through the summers, probably 1.5k to 2k a summer, then a run to Florida each Christmas. Never repacked the bearings, thought they were tight enough to hold the grease.
Had our 2013 BH 3670 since Labor Day of 2012. Had our first bearing failure today. Going to be a *****. Spindle/axle is OK, but everything else is going to have to be replaced.
Guy said it was a lack of grease, but the seals were fine. I guess I don't get that. If there's enough grease in them, the grease shouldn't go anywhere. Right?