If it were me I'd be more concerned with the structure failing during move. I think those uprights are every 20-24" on mine so imo when it's static there's a lot more support to carry the weight of a few slightly weekend square tubes. I'd also direct my welding arc to the actual braces not the permanent uprights or baseplate. It's also not going to require a lot of heat to get a decent weld imo. I'd grind where it's galvanized to prep it and an old timer told me to minimize breathing in fumes when welding galvanized.i agree with the stronger during the move, the issue is that after the move the welding will have heat treated the 14ga and it may not maintain the proper strength this is IMO.