1500 IS alot for a 12 ft single axle trailer. Th rail idea is kinda cool, as long as there is a continuous slot that you can put the rails into for variable widths. If there is only two fixed slots at that width, it isn't worth a darn. The comment above about the structure of the trailer is a good one. Trailers built with ladder frames generally ARE constructed so the ladder frame supports the structure of the trailer. However, in cases like this, this trailer is built with a wrapped tongue. With a wrapped tongue, while the whole ladder can help support the structure, it is not necessary. Flatbed trailers are built this way with these type of tongues. They are by far superior, and I know the next trailer I purchase will be constructed that way.