Mojave Bob wrote: So, for a couple of thousand dollars, you could build a trailer that is worth anywhere from couple of hundred dollars, up to $10k or more. But savings of 50% or more are very realistic with moderate skill and equipment.
Bob has hit it on the head. The only variable is the individual builders skill level, design choices and attention to detail. You can build it out of the least expensive materials or out of solid, exotic hardwoods and the finest appointments available. It doesn't matter. The simple trailer could sell for 8 or 9 thousand if the builder knows his stuff and the one with all the fancy stuff might be only good for parts, if the builder is a hack. All thing being equal, a skilled builder should be able to build a trailer that is worth twice what he has into it. If he is building it to use, with an eye towards, maybe, selling it in a year or so, then the perceived cost of his labor shouldn't be considered. If he's building it on spec, then, of course, labor should be factored in, but don't expect to value your time at prevailing wage