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Pulling actually results in deeper penetration and a slightly more crowned bead. Pushing results in shallower penetration and a flatter bead because you are pushing the hot wire out in front on colder plate. Pulling drives the hot wire back into the molten puddle.
You should be able to to sling a chain threw the tubes and apply some preload to the axle with a bottle jack. Also the truss itself acts as a good strong back to help prevent distortion.
Get some 1/4" scrap and practice practice practice. I wouldn't run under 20volts and prolly around 350 wire speed with .035 assuming you'll be mig welding it. The pumpkin is cast steel no real special procedure for welding. A little preheat 3-500 degrees will never hurt. And possibly a little...
A truss is pretty important piece to have welded correctly. Say what you want, you already admitted you can't weld worth a damn. It's not just you or your family that is put at risk, have respect for other people on the road.
It just pulls off. My guess is you have rust above the windshield leaking. The last time I had one put in my xj my windshield guy wasnt able to save the molding and threw it in without it because i had a fix it ticket. Still no molding to this day and leak free.