Well, I ordered bearings from Grainger.com (you need an account, which I have)... cost around $160 shipped for NTN bearings.
I had to order the seals from another place, so I ordered China-made bearings for my boat trailer while I was at it (cost me $28 for all of them)... the boat trailer with boat might weigh 500#s loaded, if that.
I also bought tubeless rims for the boat trailer at the local TSC... I have been holding onto two new 4. 80x8 Carlilse tires for better than 5 years (stored in a black plastic bag)... so I finally got those mounted.
The bearings on the boat trailer have been bad since I've owned it (since around 1992)... but I never towed very far, and it was not heavy. They were bad, grease had so much water in it that it started to bead up when I was cleaning the hubs! I have a set of bearing buddies for this trailer, so that should prevent this in the future.
I still have to pick up seals for the boat trailer... it uses an odd axle (3/4 inch spindle).
I'm also changing tires on the RV this weekend... !
So I got a full weekend ahead if I get everything that I ordered...