Two pieces button welded are ok.....adding plates behind it is better...best yet would be to do some homework on cutting a frame and doing it like they do when they stretch a transport truck frame or a "z" ed hot rod frame...eg 2x3" tubing cut 1.5 " into the tube then move over 3"and make another 1.5" cut then cut horizontally between the 2. Kinda like a zig zag if you will.This spreads out the stress in the frame over a larger area. You can also add "fish" plates at this time too...either into the frame or outside
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