Found this site recently and it is fantastic!! I have 3 core trailers, one 12x7 pop-up frame with crank up, one 8x7 pop-up with no mechanism and a 14x7 "Smokey" stick-built gutter trailer.
Thinking about building a stand-up 6 foot hi-low out of foam from the 12x7 trailer. Need info on the best link to read for "foamies".