I have a Hensley TS-3, which means little relative to your question. So I'll get to the point. The TS-3 is 17 3/4 inches tall. The pin box on our Trilogy is adjusted to the highest setting, and we have no issues with clearance on our rig. Our tow, has a Retrax-Pro cover, adding about 5/16 inch to the height of the bed rail, and still, no issues. All that said, our tow is a Silverado 3500. Our bed rails are 22 inches tall. Hope this is helpful.
David & Cathy
2015 Trilogy 38FL
2016 Silverado 3500HD DRW
Trailersaver TS-3 Hitch on B&W Platform