The plate on the trailer says to use 15X5/38.1X12.7 with ST205/75R15 tires. However, I looked at the installed stuff and what is on there are ST225/75R15 D range tires. I should note, that when I eyeballed it with a tape measure, the 6 lug rims appear to be 5.5" to the lug on the opposite side. Does that sound right?

The dust caps on the end of the axles said "Dexter EZ Lube" but nothing else. I didn't tear into them today... I'm still replacing the decking (it was pretty bad) and I saw a minor amount of rust I want to weld up some gussets to to make sure I have no issues (on some of the vertical spars that support the sides of the trailer and the top) -- the ones right at the back of course!

Guess I'll pull a wheel tomorrow to get brake & bearing sizes. Where do I measure on the bearings, the ID or OD ? Can I do it with the races on or do I have to remove the bearings from the races?

 

Usually I remove the bearings and races and find that the part numbers are still legible. If not, I clean them off and take them to let my trusty partsman measure them to match them up. Hopefully yours are still useable, unless they have been neglected.