guys, those cross ribs i welded on the bottom of the tubs do it all. they made the tubs super strong, got rid of the tubs making any "tin" sound, and eliminated any flex when you sit anywhere on them.
we do have a bead roller but i didn't want to go that route....everyone bead rolls their tubs, i didn't want to. i wanted my tubs to look nice, clean, and completely smooth. i wanted them to fool people into thinking they'd be all those things they're not...exactly like your guy's concerns about them
when i first mocked up the tubs i tacked the cross bracing in place to see if it would work like i wanted to. even just tacked up it increased the strength a ton. i was able to place a seat on top of them and sit on it without it flexing. when i got done fully welding the cross ribs in place the overall strength of the tub was immediately apparent. and after i welded them in the bus it was even more so...the heavy "thud thud thud" noise it makes when i was banging on it brought a smile to my face
