Spray Arc Transfer Vs. Short Circuit Welding

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Hello, I'm thinking of building myself a nice light weight but strong aluminum trailer but wanted to ask the experience in this field.I am going to build it all out of 2"x3"x3/16ths Aluminum tubing for the frame and then checkerplate aluminum for the floor and wanted to know what would be stronger and best way to weld this out,would it be spray arc transfer or short circuit welding to make this strongest at the welds.I will be welding it with ER5356 I think unless yous don't think that I need too and just use ER4043 instead.Looking forward to your comments, and thanks in advance.
Reply:Although I am not a MIG aluminum expert and only tried it once in college (only to burn through and walk back to the TIG table frustrated).  A good friend of mine is a very good aluminum mig welder and has told me that when shipbuilding they use a spray.  They run very very hot and very very fast.  And that is supposed to hold a boat together in the unforgiving ocean so i'd imagine it would hold a trailer together.
Reply:To have enough heat, it will probably spray any how.  If you get the volts close, then you can turn the knob on the spool gun to adjust the length of the arc.  Its easy to melt the contact tip down.  If you can feel the wire binding in the tip from the heat, go to a tip for aluminum or just go one size bigger.  It really helps.  I would use 5356, but thats only my opinion.  It feeds better DavidReal world weldin.  When I grow up I want to be a tig weldor.
Reply:when running .035 wire in the spool gun, we run .039 tips. the ALI wire swells up in the tip when heated."Retreat hell, were just fighting in the other direction"Miller Trailblazer 302, Extreme 12 VS, Dimension 400, Spectrum 375, HF 251D-1, Milermatic 251 w/ spoolgun  Hypertherm 1000Lincoln sp 1702000 F-450 to haul it