The MTK tower can fold down with the bimini attached in it's boot and secured to the header of the tower. On the MTE, MT1, and MT2 the bimini secured in it's boot would need to be removed to move the front legs. The MT2 is what we recommend for boats over 20 ft in length. A few key differences would be the MT2 normally has black header knobs at the top of the header section. The front legs will also be different in length The MT1 along the arc measure 69", the MT2 legs along the arc measure 85".