So buy wisely for your cheap trailer project.
My point exactly....which is why I keep saying so. Many, (most?), of the threads started on this topic are from people trying to make a decision about what to use. Post after post containing anecdotal information such as, "I made a trailer with mobile home axles and it has hauled lots of hay bales" aren't completely invaluable...but they also shouldn't be treated as hard evidence about the quality of MH axles either.
Here's something to consider in addition to the Dexter stuff I already posted:
We all apparently have internet access. We can all browse the huuuuuge variety of factory-built trailers available that are designed and built for the types of duties people on forums such as this are considering using their proposed trailer project(s) for.
How many of those manufacturers are using MH-style axles? How many choose 14.5 tires? Are they blissfully unaware of the plethora of advantages offered by those readily available, (and cheap!), axles and tires? Nope.
They are cheap. And just like everything else that's cheap.....they're cheap for a reason.
"Buy wisely" indeed.