Go to the link below and check out the FAQ, glossary and product applications manual.
Then click on Service Literature to the left; at the next screen, under 800-9,000lb axles, select the section you want, bearings, brakes
Back at the Service Lit screen, check out the Service Resource and Tech Info selections.
Then go to Product Lit >> Trailer Running Gear and select the load range for your axle
Lots of other stuf on that site, it's kinda like a Tech Treasure Hunt!
Pete and Rats who would rather hunt for dropped food on Scamp