I'm back working on the 4 cyl limo project but am starting to be concerned that the tubing size I chose for extending the frame is too small. I used 2" .120 wall square tubing and you can see in these pics how they are joined into the cart frame. Near the middle of the chassis it droops downward almost 1/2"while under load. Any ideas how the frame could be reinforced? Would it be better to stack another 2" square tubing on the underside of each frame rail or is this probably adding too much unnecessary weight on the frame? I was thinking about welding a 2 x 1 x .120 support tube instead but what about you guys, is this going to be enough structural rigidity? I can post some pictures of the frame warp tomorrow.