Hey you forgot to add about the 1200rpm or more
Many of those trailers have small tires that turn alot faster than a large car tire turns, and at 60Mph the bearings have to keep up with that too while being hammered by the pot holes in the road and carring that weight, wild sharp turns on winding roads. Dirt road dust and grime.
Then you get to the lake, drowned the bearing an hour while you launch the boat
Or as at least one woman has done, drowned the bearing for a few hours, then complain about how slow and slugish the boat is and hard to handle, not steer right etc..
Her husband was rather ticked when he went out to see what was wrong with his boat! He never let her launch it again by herself after that
Yes, it's true, she ran the boat acrossed the lake with the trailer still straped onto it, she just removed the coupler from the truck and set sail...
Man that bearing up on the tower has an EASY life compared to his boat trailer cousin
About the hubs too, make sure you do have the correct center size if that is important to your blade hub! I have a bought 8' set of blades and when I went to buy a 4 bolt trailer hub the center did not fit my blade hubs center hole, I could have reamed out the hole in the hub, but I decided to just wait and get a different hub that fits right. I think the bolts were spaced correct, but the hub was heavier duty and the bearings had a larger center hub area.