The BX, 2210, GC2310 are basically the same machine and have the same type of frame, a one piece ladder frame. The difference with the BX22 and the GC2310 is that they have a subframe added to them to handle the loads impossed by the BH. The Wallenstein BH mounts to the rear of the tractor with two pins via the upper brackets bolted to the upper rear frame fender brackets. The Lower lift arm pivot rod is replaced with a longer one that extends outside the frame to provide the lower mounting location for the BH. I believe there is no additional reinforcement to the tratcor frame with their mounting system. Once I find out I will pass that on. The frame on the 4XXX series tractor is not the same as the 2210. These have a frame that does not extend all the way to the rear of the tractor. The entire 3-point mounting is bolted to the transaxle housing, unlike the "sub compacts". They have the 3-point lower mounting located in the frame and the upper link on the transaxle housing. This is why a 3-point mount BH on the 4XXX series tractors is not recommended because the transaxle housing is taking all of the load impossed by the BH rather than the frame/subframe.