Roof Rack Shop UK supply a full range of Thule Adjustable Load Stops, which can be moved along the bar length to the desired position and secured in place.
Available in either 9cm or 25cm heights they are ideal for securing ladders, timber and much more, can be used with Thule Webbing Straps.
Models available to fit Thule Traditional Square Roof Bars and Aluminium Aero Roof Bars.