Cargo & Boat Trailer Designs

I need complete structural design packages for trailers that can haul general cargo flat bed equipment trailers and trailers for boats. One specific trailer for boats will be a heavy hydraulic lifting trailer capable for adjusting width and using 6-10 different hydraulic rests for lifting the boat... (Budget: $750 - $1500 USD, Jobs: AutoCAD, CAD/CAM, Marine Engineering, Mechanical Engineering, Structural Engineering)