This tube is overbuilt. It can easily take a 200 pound side load.   Interior is finely rough surface.  Exterior surface is smooth but not perfect. It has been wet sanded but will not give a perfect surface without further wet sanding.   Tube Specs:  ID of the tube is ~14-7/8"  OD of the tube is ~16" Length: ~50-5/8"  Weight: 12.5-12.6 lbs      Sold As Is: $950/OBO, plus shipping and handling charges.