According to Andy from Inland....
The best place to jack is between the wheels on the frame. Place your jackstands at the jacking points and lower the trailer back down on the stands.
I was told, that as a rule, you should go through 4 sets of magnets for every one set of brake shoes. As long as you cannot see magnet wire in the magnet surface they are considered OK. I think the minimum brake shoe thickness is 1/16".
2003 GMC 2500HD 4X4 D/A Ext. Cab
Propane Powered Honda EU2000i
Lots of Hot Sauce!
Air # 283