thanks for the great posts. One of the things I have found as I got started on this project is that I am trying to use the same wheel on my trailer as I have on my pulling vehicle. this way I can get double duty out of my spare tires. Most good trailer base builders can spec a type of wheel. Also finding that I need a double axle which brings some unique problems with it. Double axles tend to throw debris into back tire a lot. Plan to carry at leas two spares for the trailer.You are right, these are not cheap but they do offer good idea's and plan for a home made one...