The Tank Trailer wood model has a medium level of assembly complexity. It will take you about six hours to assemble this addition to the Big Rig. This time will fly by as the process is easy and fun! You will find the detailed instructions included in every WoodTrick set to be a great help during the assembly process! The Tank Trailer is lightweight because it is made of plywood. This trailer will not slow down the Big Rig when in motion, and the two models look perfect together! In addition, this material is environmentally-friendly, and does not require glue to assemble. Our 3D Big Rig, Tank Trailer, and Car Trailer models are the complete set that you can buy for yourself or as a gift for a loved one. Fans of big cars and interesting and complex puzzles will appreciate such a gift!