Overhead boat house kits mount to the joists or I-beams of your boathouse and come with either slings or a cradle. This is the most common as well as economical option considering that you already have a boathouse built. These kits come in either a single line pull or double line pull configuration, which refers to the cable attaching to either your joists or to your sling or cradle. Lift speeds range from 1’ per minute travel up to 4’ per minute travel. Ratings start at a basic 2800-lbs and go up to a 12,500-lb rating.