To amplify Bob's comments on stainless, we were using line that came straight. We've since found SS in coils that was easier to form (nowhere near cooked spaghetti nor like old dry spaghetti). Straighten from the coil as you go, but then you are forming the curves on the fly and would have to do the flares (at least some of them) on the truck (and stainless doesn't always flare nicely, particularly with cheap tools). I did the 15cwt trailer with copper-nickel line and it did form nicely to follow the frame contour, through cross-members and flare on the trailer
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