The fiberglass Jeep-tub trailer kit that I've described in this thread has been on the market now for about 7 months, and the company that's marketing them has done very well with them so far (Dinoot Trailers - Dinoot Jeep Trailers
Based on that success, I'm starting another trailer tub kit project - this one is patterned after the military M100/M416 trailers. The military-style trailers are very popular among the adventuring, overlanding and off-road crowd, but reasonably restorable original military examples are getting very hard to find, and the new versions of these trailers offered by trailer vendors are very expensive. So I've designed and will be building a fiberglass military-style tub kit that's intended to be very affordable and assembled in a home garage or driveway by a DIY-er.
I'm planning this tub kit to be molded in both a 6' version (same as the original military trailers) and 4'version (for a very budget-friendly installation on a Harbor Freight Mini Trailer frame.
I've done a few 1/4 scale concept models of the design:
I'll be starting a build thread for the full-scale fiberglass molds and prototype trailers soon, I'll post a link to it as soon as I start the thread.