Re: 14" tires with 5 lugs, are they all the same????
The 14" rims on my storage trailer, a tandem axle full roller Sea Lion, are from a Ford Aerostar, the tires are St rated trailer tires. The lug patter 5 on 4.5" is common to Ford passenger car and some Chrysler products. The offset is fine with the Aerostar/Ranger rims, a buddy of mine even took them to work and had them galvanized for me. They are at least as heavy as the original rims, which rotted away years ago. These have been on there for about 12 years now.
The original tires weren't ST rated, that trailer came with standard bias ply tires. They were just super heavy duty. I only use it to store a boat for the off season, and it only travels a few miles a year, so for me, the tires aren't all that important. It will never see highway use or any real speeds. I have ST rated tires on it only because they were free.