I have an aluminum boat trailer that has 2 5" I-Beams running from the back of the boat then bending in to attach to a 3x3 square tube (steel) on which is attached the ball hitch. Even with a swing hinge, the trailer is too long to fit in my garage. I want to cut the two i-beams about 15" back from where they attach to the square tube. I will reconnect them by installing 30" pieces of aluminum channel in each side of the i-beams. I will effectively be sandwiching the beams with 15" of channel on each side of the cut and on both sides of each beam. The thickness of the channel is the same as the i-beams so the finished product will be twice the thickness of the original beams for 30 " along their length. The tung weight at the cut point is about 150lbs due to the fact that it has tandem axles and is well balanced. The only force on this joint should therefore be in the horizontal plane in pulling and stopping. I plan to bolt everything together (no welding) Any comments or suggestions?