support arm stackers offer an effective and economical solution for all types of store - big or small. bt offers the most complete range for all types of application, with exceptional lift heights - up to 6.3m. all bt sta......support arm stackers offer an effective and economical solution for all types of store - big or small. bt offers the most complete range for all types of application, with exceptional lift heights - up to 6.3m. all bt stackers have safety, performance and easy servicing as key characteristics. for the majority of stacking applications, bt provides its stacker range - for both standard and high intensity operations. standard stacker models have capacities of 1000 to 1250kg, whilst the high intensity models offer capacities up to 1600 kilograms and lift heights to 5.4 metres.