The fellow who hauls and transports my boat is a master of many trades, including the construction of the hydraulic trailers that he uses. While he was doing a fiberglass and paint project on our boat, he built, from scratch, a custom designed trailer for a boat club in Alaska. IMHO, he could design and build whatever your group needs. Being a Maine craftsman, there is good value in his work. Let me know if you would like contact info.