Since I just bought an 18' trailer I was thinking about this very issue. It has a one-piece, drop-down ramp with no supports for the forward edge of the ramp or the rear of the trailer. I was already planning to reinforce the ramp itself with extra angle iron, but wondered if it would work to weld supports to the forward edge of the ramp
, that would be vertical when the ramp is lowered, like some of the car haulers have? That way they would act like jack stands under the hinged area. I can't find a photo of one right now, but it would be 3 pieces of angle iron welded together in the shape of a square "C", then the open end welded to the ramp (one on the left side and one on the right). With the ramp in the UP position, they would stick out horizontally.
If this makes ANY sense, I would appreciate opinions as to whether this would be sufficient.
Here's the trailer, as long as the post stays up!http://raleigh.craigslist.org/grd/3153875054.html